A great book to start with is Marci B. Hoffman & Robert C. Berring, International Legal Research in a Nutshell (2017). This book provides a basic introduction to international legal research for the non-specialist. It offers guidance through the unfamiliar pathways of research using international legal materials and demystifies the world of treaties. Since it's aimed at the non-specialist, it provides straight-forward background information on the United Nations and the European Union and includes guidance for using the documents and legal materials of these institutions. There are extensive links to the rich world of Web resources, but it also describes paper research tools that remain important in this field. Finally, it sets out a road map for approaching an international legal research problem.
Another useful resource is Guide to International Legal Research (2020). This book provides an overview of sources of international law, including the traditional sources like conventions and customs, while introducing the influence of municipal courts and soft law. Chapters are arranged by geographic region – like South Asia and the Middle East – and by subject – like intellectual property and maritime law.
Citations to international and foreign sources can be incredibly confusing. In the Bluebook, be sure to read the entirety of Rules 20 (Foreign Materials) and 21 (International Materials) in conjunction with their relevant tables in T1 and T2. You may also wish to consult N.Y. Univ. Sch. of Law Journal of Int’l Law & Politics, Guide to Foreign and International Legal Citations (2nd ed. 2009). K89 .G85 2009 (Reference).
Abbreviations and acronyms are abundant. For help deciphering (when you don’t find it on Google):
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