Below are some examples of international case-law, and how they can be dealt with in Zotero. They do not intend to be the unique way to deal with this kind of document, just a starting point, who can then be adapted.
International Court of Justice
Citation using the Zotero European Journal of International Law style:
Legal Consequences for States of the Continued Presence of South Africa in Namibia (South West Africa) notwithstanding Security Council Resolution 276 (1970) (Advisory Opinion), 21 June 1971, I.C.J. Reports (1971) 12.
International Criminal Tribunals
Citation in Zotero European Journal of International Law style:
Tadic Case (Judgment), 26 January 2000, ICTY-94-1.