APA (7th ed.) Citation

Lawrence, T. J., & Winfield, P. H. (1923). The principles of international law (7th ed.). D. C. Heath.

Chicago Style (17th ed.) Citation

Lawrence, T. J., and Percy Henry Winfield. The Principles of International Law. 7th ed. Boston, New York: D. C. Heath, 1923.

MLA (9th ed.) Citation

Lawrence, T. J., and Percy Henry Winfield. The Principles of International Law. 7th ed. D. C. Heath, 1923.