OJPP has been indexed by several world class databases, for more information, please access the following links:

Google Scholar
There are 14 citations for articles published in OJPP journal as of April, 2013 based on the statistics from Google Scholar.

Academic Journals Database
Academic keys
Academic OneFile 
Base-Search

Catalog for Indiana University Library (IUCAT)

CrossRef
Directory of Open Access Journals (DOAJ)
EBSCO A-to-Z

Gale
Georgia State University Library (GSU)

IndexCopernicus
InfoTrac Custom
JournalSeek

JournalTOCs
Literature Resource Center
Mlibrary
National Library of Australia

New York University Libraries (NYU)

OneSearch

Open Access Library
Proquest
Religion and Philosophy Collection

San Jose State University Library (SJSU)

Scirus

SHERPA/RoMEO

SSRN
Standard Periodical Directory(Mediafinder)
Technical University of Denmark Library (DTU)

the British Library

The Open Access Digital Library
trueserials.com

Ulrich

Universe Digital Library (UDL)

Worldcat
Zeitschriftendatenbank (ZDB)