International Law: General Sources: Sources for researching state practice of international law

By Ralph F. Gaebler & Alison A. Shea.

Includes links to Foreign Ministry websites for some countries. Those websites might include diplomatic documents, news releases, etc.
Collections of diplomatic documents and state papers, or works citing these materials, may exist for some countries, but are not necessarily up to date or widely available to researchers. Also try searching in library catalogs with subject searches such as "China foreign relations" or "France history sources." Also try keyword searches related to your topic plus words such as practice, digest, repertoire, etc.

Example of yearbooks and journals that may summarize judicial and legislative developments and diplomatic and government activity and cite cases, documents and scholarly articles.

Title search; Keyword search (in the appropriate language, such as annual, yearbook, year book, journal, or review, plus international, plus the truncated name of the country or region, e.g. Canad*, Asia*, South Africa*. or Journal title search); Journal Title search.

Contains some additional yearbooks of international law.

According to the Introduction to volume 1 (1951), this is a "systematic collection of those national legislative texts which deal with matters of international concern and constitute evidence of the practice of States in the field of international law."