These sources provide citations to treaties and, often, basic status information, such as whether the treaty is in force, which states are signatories, which states are parties, whether there any reservations, etc.
The last section of this page gives a couple of starting places for finding the drafting histories of treaties.
Use these online and print resources when you are researching multilateral treaties.
Use these online and print resources when you are researching treaties — multilateral or bilateral — to which the United States is a party.
Try these sources if you are looking for the drafting history of a treaty.
Consider using a treaty commentary when you need in-depth information on the background and possible meaning of a treaty's language, or when you need some ammunition to argue for your preferred way of reading specific treaty language.
This PDF guide explains treaty commentaries and lists the commentaries available at the Zief Law Library.