Paleontological Society
Palgrave Macmillan Ltd.
Paper Industry Technical Association
Pearson
Pearson Crystal Data
Pennsylvenia State University
PennWell Corp.
Pergamon Press
Perspective Publications Private Limited
Pharmaceutical Press
Philosophy Documentation Center
Philosophy Education Society, Inc.
PHILOSOPHY NOW
PHOTON Publishing GmbH
Pierian Press
Pion Ltd.
PION Publication
Polska Akademia Nauk
Portland Costomer Service
Portland Press Ltd
Praxis Consulting & Information Services Pvt. Ltd.
Precast - Prestressed Concrete Institute
Preston Publications, Inc.
Princeton University Press
Printerhall Ltd.
Professional Engineering Publishing Ltd.
Project Hope
ProQuest
Psychology Press
Publication Committee for the Tokyo Journal of Mathematics
Publishing House Element
Publishing Technology PLC.