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Primary Sources of International Law
Custom and State Practice
Publications of the US State Department and International yearbooks can provide evidence of customary international law. International yearbooks provide surveys of the practices of specific States and/or geographical areas within the international law arena. Many Intergovernmental Organizations also publish yearbooks.
US Department of State
Digest of the US Practice in International Law
The Office of the Legal Adviser publishes the annual Digest of United States Practice in International Law to provide the public with a historical record of the views and practice of the Government of the United States in public and private international law. Annual volumes for 2000 through 2010, a two-volume set covering 1991-1999, and a volume for 1989-1990 have been published on-line and in hard copy.
The British Yearbook of International Law
BYBIL offers unique insight into the developing state practice of the United Kingdom, through a comprehensive collection of decisions in British courts and official statements of the UK position on international law, and features a collection of extended articles providing an unrivaled overview of the latest scholarship on questions facing international law.
African Yearbook of International Law
Founded in 1993, the African Yearbook, now also published online is published under the auspices of the African Foundation for International Law. It is the only scholarly publication devoted exclusively to the study, development, dissemination and wider appreciation of international law in Africa as a whole. Through the scholarly analysis of international legal issues of particular relevance to the African continent, it also contributes to the acceptance of, and respect for the rule of law in intra-African relations, and for the principles of international law in general. Its uniqueness however goes beyond this, for through its special themes and general articles, it has succeeded over the years to serve as an intellectual forum where the development of international law is viewed as being integral to Africa’s own development.
The Palestine Yearbook of International Law
The Palestine Yearbook of International Law is an unparalleled reference work for legal matters about and related to Palestine. The Yearbook regularly features English-language articles reviewing contemporary legal questions as well as translations of key legislation, court decisions, and academic material. It is intended for use by legal practitioners, government officials, researchers, scholars, and students. Published in cooperation with the Birzeit University Institute of Law, the Yearbook is a valuable resource for anyone seeking well-researched and timely information about Palestine and related legal issues.
Yearbook of the United Nations
The Yearbook of the United Nations—published by the Department of Public Information—stands as the authoritative reference work on the activities and concerns of the Organization. Based on official UN documents, the Yearbook provides comprehensive coverage of political and security matters, human rights issues, economic and social questions, legal issues, and institutional, administrative and budgetary matters.
Other Helpful sites
Globalex Research Guide
Researching Customary International Law, State Practice and the Pronouncements of States regarding International Law