- Max-Planck Institute - Library Catalogue
https://www.mpil.de/en/pub/library.cfm
- European University Institute - Library
https://www.eui.eu/en/services/library
- USA - Library of Congress
- Yale Law School - Avalon Project
- Fletcher School of Law and Diplomacy
- University of Chicago - International Law Database
www.lib.uchicago.edu/~llou/forintlaw.html
- Italian National Librarian Service
- University of Minnesota - Human Rights Library
www1.umn.edu/humanrts/index.html
- New York University Law Library - Guide to Foreign and International Legal Database
www.law.nyu.edu/library/foreign_intl/index.html
- T.M.C. Asser Instituut