Publisher RDF
pages:- Now Publishers
- Oles Honchar Dnipropetrovsk National University
- Omnia Publisher SL
- Optica Publishing Group
- OU Scientific Route
- Oxford University Press (OUP)
- PAGEPress Publications
- Pakistan Academy of Sciences
- Pandawa Institute
- PCSIR-Scientific Information Center
- PeerJ
- Penerbit Universiti Kebangsaan Malaysia (UKM Press)
- Penerbit Universiti Malaysia Perlis
- Penerbit Universiti Sains Malaysia
- Penerbit UTHM
- Penerbit UTM Press
- Periodica Polytechnica Budapest University of Technology and Economics
- Pleiades Publishing Ltd
- Polish Academy of Sciences Chancellery
- Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne
- Praise Worthy Prize
- Productivity Press
- Project MUSE
- Public Library of Science (PLoS)
- Pushpa Publishing House
- Qualitative Research Association of Malaysia
- Rajarambapu Institute of Technology
- Ram Arti Publishers
- Richtmann Publishing
- Routledge