Libraries and Information Resources Centres
- Amazon http://www.amazon.com
- Ariadne http://www.ariadne.ac.uk/
- Bibliotheque national de France http://www.bnf.fr/
- British Library http://www.bl.uk/
- Boston Public Library http://www.bpl.org/
- Brooklyn Public Library http://brooklynpubliclibrary.org/
- California Institute of technology (Caltech) https://www.library.caltech.edu/
- Cincinnati & Hamilton County Public http://www.cincinnatilibrary.org/
- Chicago Public Library http://www.chipublib.org/
- COPAC http://copac.ac.uk/copac/
- County of Los Angeles Public Library http://www.colapublib.org/
- Dalnevostochhnaya Gosudartvennaya Biblioteka http://www.fessl.ru/
- ETH Zurich Library http://www.library.ethz.ch/en/
- Europeana http://www.europeana.eu/portal/
- Harvard University Library http://lib.harvard.edu/
- Imperial College London Library https://www.imperial.ac.uk/admin-services/library/
- Ingenta Connect http://www.ingentaconnect.com/
- International Federation of Library Associations http://www.ifla.org/
- Library of Congress http://www.loc.gov/
- M25 Consortium of Higher Education Libraries http://www.m25lib.ac.uk/
- Massachusetts Institute of Technology https://libraries.mit.edu/
- Multnonah County Library http://www.multcolib.org
- Nacionalna i sveucilisna knjiznica, Zagreb http://www.nsk.hr/
- Nacionalna i univerzitetska biblioteka "Sv. Kliment Ohridski" Skopje http://www.vbm.mk/cobiss/
- Nanyang Technological University Singapore http://www.ntu.edu.sg/Library/Pages/default.aspx
- Narodna in univerzitetna knjiznica Ljubljana http://www.nuk.uni-lj.si/
- National and University Library of RS http://nub.rs/pocetna/
- National Library of Australia http://www.nla.gov.au/
- National Library of Canada and National Archives of Canada http://www.nlc-bnc.ca/
- National Library of Czech Republic http://www.nkp.cz/
- National Library of New Zealand http://www.natlib.govt.nz/
- National Library of Scotland http://www.nls.uk/
- New York Public Library http://www.nypl.org/
- Oxford Libraries http://www.bodley.ox.ac.uk/oxlip/
- Princeton University Library http://library.princeton.edu/
- Queen's Borough Public Library http://www.queenslibrary.org/
- RLG - The Research Libraries Group http://www.rlg.org/
- Stanford University Library http://library.stanford.edu/
- The European Library (TEL) http://www.theeuropeanlibrary.org/
- The www Virtual Library http://vlib.org
- UKOLN WWW service http://www.ukoln.ac.uk/
- University College London Library http://www.ucl.ac.uk/library
- University of California-Berkeley http://www.lib.berkeley.edu/
- University of California-Los Angeles Library http://www2.library.ucla.edu/
- University of Cambridge Library http://www.lib.cam.ac.uk/
- University of Chicago Library https://www.lib.uchicago.edu/
- University of Illinois-Urbana Library http://www.library.uiuc.edu/
- University of Michigan Library http://www.lib.umich.edu/
- University of Texas Library http://www.lib.utexas.edu/
- University of Toronto Libraries http://www.library.utoronto.ca/
- Univerzitetska biblioteka "Svetozar Markovic" Beograd http://www.unilib.rs/
- WorldCat http://www.worldcat.org/
- Yale University Library http://www.library.yale.edu/