Opulus Press <http://www.opuluspress.se/>

Organisation Internationale de la Vigne et du Vin  <http://www.oiv.org/>

Ovid Technologies <http://www.ovid.com/>

Oxford University Press  <http://ukcatalogue.oup.com/>

Patron Editore <http://www.patroneditore.com/>

Pisa University Press  <http://www.edizioniplus.it/>

Plant Management Network International  <http://www.plantmanagementnetwork.org/>

Polska Akademia Nauk  <http://www.pan.pl/>

Portland Press <http://www.portlandpress.com>

Potato Association of America  <http://potatoassociation.org/>

Proquest Information and Learning  <http://www.proquest.co.uk/>

Public Library of Science <http://www.plos.org>

Rockefeller University Press <http://www.rupress.org/>

Royal Society <http://royalsociety.org/>

Royal Society of Chemistry <http://www.rsc.org/>

Royal Society of New Zealand  <http://www.royalsociety.org.nz/>

Royal Statistical Society <http://www.rss.org.uk/>

Royal Swedish Academy of Sciences <http://www.kva.se/en/>

ultimo aggiornamento: 12/04/2011