APA (7th ed.) Citation

Gray, J. C., & Gray, R. (1931). The nature and sources of the law (2d ed.). Macmillan.

Chicago Style (17th ed.) Citation

Gray, John Chipman, and Roland Gray. The Nature and Sources of the Law. 2d ed. New York: Macmillan, 1931.

MLA (9th ed.) Citation

Gray, John Chipman, and Roland Gray. The Nature and Sources of the Law. 2d ed. Macmillan, 1931.