APA (7th ed.) Citation

Oppenheim, L., Jennings, R. Y., & Watts, A. (1992). Oppenheim's international law. Longmans.

Chicago Style (17th ed.) Citation

Oppenheim, L., R. Y. Jennings, and Arthur Watts. Oppenheim's International Law. London: Longmans, 1992.

MLA (9th ed.) Citation

Oppenheim, L., et al. Oppenheim's International Law. Longmans, 1992.