APA

Gray J. C., Gray R., . (1924). The nature and sources of the law. New York: The Macmillan Company.

Chicago

Gray John Chipman, Gray Roland, . 1924. The nature and sources of the law. New York: The Macmillan Company.

Harvard

Gray J. C., Gray R., . (1924). The nature and sources of the law. New York: The Macmillan Company.

MLA

Gray John Chipman, Gray Roland, . The nature and sources of the law. New York: The Macmillan Company. 1924.