APA (7th ed.) Citation

Gray, J. C. (1909). The nature and sources of the law. The Columbia University Press.

Chicago Style (17th ed.) Citation

Gray, John Chipman. The Nature and Sources of the Law. New York: The Columbia University Press, 1909.

MLA (9th ed.) Citation

Gray, John Chipman. The Nature and Sources of the Law. The Columbia University Press, 1909.