When searching for customary international law, it is easiest to start with secondary sources. Periodicals are a good way to obtain background information, locate a citation or even find the actual text of a foreign law. These articles can provide useful descriptions of the state of customary international environmental law and primary sources.
Yearbooks provide surveys of State practice in international law. They may also provide information on national case law or legislation concerning matters of international law, making them excellent places to start your research.
The Yearbook of International Environmental Law identifies significant annual developments and instruments with attention to emerging principles of customary international law. It is available in print and online.
Other international yearbooks are available as part of the "Foreign & International Law Resources Database" on HeinOnline.
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