Burns Law Library Q&A

There are several indexes that you can use to find an official citation to a multilateral treaty:

1. Multilateral Treaties Deposited with the Secretary-General provides citation information for multilateral treaties deposited with the Secretary-General of the UN. It is available in print and on the United Nations Treaty Collection website.
    
2. The Multilateral Treaty Calendar by Christian Wiktor provides citations to multilateral treaties for the period 1648-1995. Treaties are arranged in the index chronologically by the date of signing. Treaties are also indexed by subject, the international organization responsible, international conference, etc.  It is available in print and on HeinOnline.
    
3. Multilateral Treaties: Index and Current Status indexes approximately 800 treaties from 1856 - 1995. 
    
4. The U.S. State Department's Treaties in Force indexes multilateral treaties that the United States is a party to. See section two of the index for a listing of multilateral treaties by subject. It is available in print, on the State Department's website, and on HeinOnline.
    
5. See Bluebook Rule 21.4 and Table 4 (T4) for citing a treaty among more than two parties.

For more information about treaty research see A Guide to Treaty Research or the Treaties and International Agreements guide.