Butler, W. E. (1987). International Law and the International System. Leiden ; Boston: Brill | Nijhoff.
Chicago Style CitationButler, William E.. International Law and the International System. Leiden ; Boston: Brill | Nijhoff, 1987.
MLA CitationButler, William E.. International Law and the International System. Leiden ; Boston: Brill | Nijhoff, 1987.