| Pabst Science Publishers | Pacific Coast Entomological Society |
| Pacific Coast Society of Orthodontists | Pacific Employment Relations Association |
| Pacific Journal of Mathematics | Pacific Magazine |
| Pacific Northwest Fungi Project | Pacific Northwest National Laboratory |
| Pacific Rim College of Psychiatrists | Pacific Science Association |
| PacificBasin Communications, LLC | Pacini Editore SpA |
| PAGEPress | Pain Research |
| Pakistan Association of Pathologists | Pakistan Agricultural Scientists Forum |
| Pakistan Institute of Nuclear Science and Technology | Pakistan Medical Research Council |
| Pakistan Pediatric Association | Pakistan Physiological Society |
| Pakistan Psychiatric Society | Pakistan society of Neurology |
| Palacky University | Palaeontological Association |
| PalArch Foundation | Paleoanthropology Society |
| Paleontological Society | Paleontological Society of Japan |
| Palgrave Macmillan Ltd | Paljor Publications |
| Pamij | Pamukkale University |
| Pan African Association of Neurological Sciences | Pan American Health Organization |
| Pan American Society for Clinical Virology | PAN Partners |
| Pan-American Journal of Aquatic Sciences | PanGlobal Media |
| Paper Industry Management Association | Paperloop |
| Papers in Physics | Parade Publications |
| Paragraph Publishing Ltd | Parasitological Institute, Slovak Academy of Sciences |
| Parenteral Drug Association Inc. | Parenteral Drug Association Japan Chapter |
| Park Ridge Center for Health, Faith, and Ethics | Parks and Leisure Australia |
| Parthenon Publishing Group | Partnership: Provincial and Territorial Library Associations of Canada |
| Passi Publications | Pasteur Institute |
| Pasteur Institute of Iran | Paulo and Nita Freire International Project for Critical Pedagogy |
| Pavilion Journals | Pavilion Publishing |
| PBI Media | PC World Communications |
| Peace History Society | Peace Science Society (International) |
| Pediatric Infectious Diseases Society | Pediatric Orthopaedic Society of North America |
| Peeters Publishers | Peking University Press |
| PEMEA | Pender Bros. |
| Penerbit Universiti Sains Malaysia | Penerbit USM |
| Penn State University Press | Pennnet |
| Pennsylvania Historical Association | Pennsylvania Institute of Certified Public Accountants |
| Pennsylvania Prison Society | Pennsylvania State University |
| PennWell Corporation | Pennwell Publishing Company |
| Pensoft Publishers | Pentecostal-Charismatic Theological Inquiry International |
| Penton Media, Inc | Penton Technology Media |
| People With Aids Working for Health, Inc. | Peppercorn Books & Press Inc |
| Perceptual and Motor Skills, Psychological Reports | Periodica Polytechnica |
| Peripheral Nerve Society | Perkin-elmer Corporation |
| Permanente Journal | Pernille Harsting |
| Perpetuity Press | Personnel Psychology |
| Perspectives on Evil and Human Wickedness | Pesticide Action Network North America |
| Pesticide Science Society of Japan | Peter Lang AG |
| Peter Li Education Group | Petersen's Bowhunting |
| Petra Christian University | Petroleum Economist Ltd. |
| Petroleum Journals Online | Pfingsten Publishing, L.L.C |
| Pharma Science Monitor | Pharmaceutical Press |
| Pharmaceutical Representative | Pharmaceutical Society of Japan |
| Pharmaceutical Society of Japan | Pharmaceutical Society of Korea |
| Pharmaceutical Society of South Africa | Pharmaceutical Users Software Exchange |
| Pharmacognosy Network Worldwide | Pharmacotherapy Group |
| Pharmacy & Therapeutics Society | Pharmainfo.net |
| PharmaLinx LLC | Pharmamed Mado Ltd |
| PharmaPress Ltd | PharmaTimes |
| PharmSciDirect Publications | Pharos Media & Publishing Private Limited |
| Phi Alpha Theta History Honor Society | Phi Beta Kappa Society |
| Philip Merrill College of Journalism | Philippine Agricultural Scientist |
| Philippine E-Journals | Philippine Educational Measurement and Evaluation Association |
| Philippine Institute for Development Studies | Philippine Population Association |
| Philological Society | Philosophers Magazine |
| Philosophy and Social Action | Philosophy Department, University of Melbourne |
| Philosophy Documentation Center | Philosophy of Education Society of Australasia |
| Philosophy of Education Society of Great Britain | Philosophy of Science Society, Japan |
| Photomedicine Society | Photonics Society of Poland |
| Phycological Society of America | Physical and Health Education Canada |
| Physical Society of Japan | Physicians Postgraduate Press, Inc |
| Physiological Society | Physiological Society of Japan |
| Physiological Society of Thailand | Phytochemical Society of Europe |
| Phytopathological Society of Japan | PIAP - Industrial Research Institute for Automation and Measurements |
| Pier Professional | Pileline Publishing |
| Pilgrims Language Courses | Pinnacle Publishing |
| Pion Limited | Pioneer Development Resources Inc |
| Pizza Today | PJB Publications Ltd |
| Planetary Science Research Discoveries | Plant Management Network |
| Pleiades Publishing, Inc | Plymouth State University |
| Poetics and Linguistics Association | Poetry Society |
| Polanyi Society | Polar Research Institute of China |
| Polarographic Society of Japan | POLICE Magazine |
| Policy Association for an Open Society | Policy Press |
| Policy Research Initiative | Policy Studies Organization |
| Polish Academy of Sciences | Polish Association for the Study of the Liver |
| Polish Biochemical Society | Polish Geological Institute |
| Polish Heart Journal | Polish Institute of Arts & Sciences of America |
| Polish Journal of Radiology | Polish Journal of Veterinary Sciences |
| Polish Librarians Association | Polish Music Reference Center |
| Polish Society of Microbiologist | Polish Study Group of Head and Neck Cancer |
| Politehnica Publishing House | Political Science Research Centre |
| Political Studies Association | Polygon Media Ltd |
| polylog. Forum für interkulturelle Philosophie e.V. | Pondicherry University |
| Pontificia Universidad Catolica de Chile | Pontificia Universidad Católica de Valparaíso |
| Pontificia Universidad Javeriana | Pontifícia Universidade Católica de São Paulo - PUC-SP |
| Pontifícia Universidade Católica do Rio de Janeiro | Population Association of America |
| Population Council | Population Reference Bureau |
| Population Review Publications | Poracom Academic Publishers |
| Portland Press Limited | Portuguese Wildlife Society |
| Positive Futures Network | Positive Health Publications Ltd |
| Post Graduate Institute of Medical Education & Research | Postgraduate Institute of Medicine, University of Colombo |
| Potash & Phosphate Institute | Potato Association of America |
| Potomac Institute Press | Poultry Science Association Inc |
| PowerPlant Chemistry GmbH | Poznan University of Technology |
| PPM Communcations, Inc | PrAcademics Press |
| Practical Action Publishing | Prague Development Center |
| Prague James Joyce Centre | Prairie View A&M University |
| Pravara Institute of Medical Sciences | Pravda.RU |
| Precast/Prestressed Concrete Institute | Premchand Shantidevi Research Foundation |
| Preston Publications | Primary Care Diabetes Europe |
| Primate Society of Great Britain | PRIMEDIA Business Magazines & Media Inc. |
| Primedia History Group magazines | Prince of Songkla University |
| Princeton Theological Seminary | Princeton University |
| Priory Lodge Education Ltd. | Private Air Magazine |
| PRO-ED, Inc | Pró-Fono Produtos Especializados para Fonoaudiologia Ltda |
| Procter & Gamble Company | Product Development & Management Association |
| Production and Operations Management Society | Production Engineering Institute |
| Prof. Barry Rubin | Prof.Dr. Jan van der Hoeven-Foundation for Theoretical Biology, Leiden University |
| Professional Advanced Services in Mental Health and Addiction | Professional Association for Cactus Development |
| Professional Engineering Publishing | Professional Medical Journal |
| Professional Medical Publications | Professional Photographers of America, Inc |
| Professional Surveyors Publishing Co., Inc. | Professor Anil Aggrawal |
| Professor T.D. Wilson | Profile Publishing Limited |
| Programa de Pós-Graduação em Antropologia Social | Programa de Pós-Graduação em Educação para a Ciência |
| Progressio | Progressive Librarians Guild |
| Project Management Institute | Project Manager Today |
| Project Muse | Prometheus Books |
| Prometheus Press S L | Prospect Publishing |
| Prosper Publications, LLC | Protection Of Plant Varieties & Farmers Rights Authority |
| Protein Society | Prous Science |
| Providence Business News | Psi Chi |
| PsychNology Journal | Psychologia Society |
| Psychological Assessment Resources, Inc., | Psychology Press |
| Psychometric Society | Psychonomic Society Publications |
| Public Health Association of Australia Inc | Public Health Division of NSW |
| Public Library of Science | Public Record Office Victoria |
| Public Relations Quarterly | Public Relations Society of America |
| Public Service Research Foundation | Public Utilities Reports |
| Publicationes Mathematicae | Publications & Communications LP |
| Publicom Incorporated | Publimedia Communications Inc. |
| Pulmonary Vascular Research Institute | Pulp and Paper Technical Association of Canada |
| Pulsus Group Inc | Pumps India |
| Pune Indian Statistical Association | Punjab Agricultural University |
| Purdue University Press | Pushpa Publishing House |
| Putman Media, Inc. | Python Papers Anthology |
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