Oxford Scholarship Online - Law contains many ebooks on international law.
Oxford Scholarly Authorities on International Law - access to leading books on internaitonal law.
OECD publications can be accessed online via OECD iLibrary
Browse the Law Library shelves on Level 3 at call numbers starting with:
U (United Nations)
W (Treatises, comprehensive works)
X (Law of the sea, Air and space law, War)
Y (International crimes, International trade)
Z (Other international law subjects)
The AGLC3 covers international materials in Part IV:
Chapter 7 - Treaties
Chapter 8 - United Nations Materials
Chapter 9 - International Court of Justice
Chapter 10 - International Arbitral & Tribunal Decisions
Chapter 11 - International Criminal Tribunals & Courts
Chapter 12 - International Econoic Materials
Chapter 13 - European Supranational Materials
Article 38(1) of the Statute of the International Court of Justice sets out the sources of international law used by the Court.
Take a look at this Timeline of the History of International Law (Oxford Academic)
International yearbooks & periodicals (Hein Online) reflecting the Custom of Nations
International Legal Materials (ILM) reproduces the full-text of international materials (also available on Westlaw, Lexis and in print).
Harvard Research in International Law (Hein Online)
Oxford Public International Law (OUP) - portal to OUP databases: Oxford Reports on International Law, Max Planck Encyclopaedia of Public International Law, Oxford Scholarly Authorities on International Law, and Oxford International Organizations.
Oxford Scholarly Authorities on International Law (OSAIL) Contains full-text online editions of market-leading reference works and treatises published by Oxford University Press, such as Oppenheim, and the Oxford Commentaries on International Law.
Oxford Bibliographies - International Law - developed cooperatively with scholars worldwide, Oxford Bibliographies in International Law offers authoritative research guides
Yearbooks of the International Law Commission (Hein Online)
International Criminal Tribunals: A Visual Overview (Leitner Center for International Law and Justice at Fordham Law School)
SHERLOC - The SHERLOC portal is an initiative to facilitate the dissemination of information regarding the implementation of the UN Convention against Transnational Organized Crime, the three Protocols thereto and the international legal framework against terrorism.
Antislavery in Domestic Legislation (University of Nottingham and Monash University)
Human Trafficking Database (Michigan Law School)
Intellectual Property Law Collection (Hein Online)
TRIPS [ trade-related aspects of intellectual property rights ]
material on the WTO website. (includes History: derestricted Uruguay Round negotiating documents on TRIPS)
WIPO-Lex - consisting of IP laws and regulations, WIPO-administered treaties and IP‑related treaties, and IP judgments.
Law of the Sea
RefLaw - an online forum offering critical analysis on important new cases, legislation, and emerging issues in refugee law.
OUP Resources on Refugee Law (free access to over 30 book chapters, journal articles and online content from OUP)
IBFD (International Bureau of Fiscal Documentation)
The Philip C. Jessup International Law Moot Court Competition Compendium (Hein Online) contains award winning memorials, problems, bench memoranda and official rules, as well as articles from:
The Law Library holds DVDs of the final rounds of the winning teams from 2000 to the current year and print versions of the memorials.
Researching international law [PDF] (Jessup Guide)