Treaties by Richard Gardiner

Treaty Interpretation by Richard K. Gardiner

Aust's Modern Treaty Law and Practice by Jeremy Hill

Custom as a Source of Law by David J. Bederman

International law theories : An inquiry into different ways of thinking by Bianchi, A.

Brownlie's Principles of Public International Law by James Crawford

Cases and Materials on International Law by Harris, David., and Sandesh. Sivakumaran

Oppenheim's International Law by Jennings & Watts

Oppenheim's International Law by Jennings & Watts

The Law of Treaties by Kolb

Reexamining Customary International Law by Brian D. Lepard (Editor)

The Oxford Handbook of the Theory of International Law by Orford (Editor); Florian Hoffmann (Editor); Martin Clark (Assisted by)

Vienna convention on the law of treaties : a commentary by Oliver Dörr Kirsten Schmalenbach

Public International Law by Emily Crawford (Editor); Alison Pert (Editor); Ben Saul (Editor)