Cita APA (7a ed.)

Gray, J. C., & Gray, R. (1963). The nature and sources of the law (2d ed. from the author's notes, by Roland Gray.). Beacon Press.

Cita Chicago Style (17a ed.)

Gray, John Chipman, y Roland Gray. The Nature and Sources of the Law. 2d ed. from the author's notes, by Roland Gray. Boston: Beacon Press, 1963.

Cita MLA (9a ed.)

Gray, John Chipman, y Roland Gray. The Nature and Sources of the Law. 2d ed. from the author's notes, by Roland Gray. Beacon Press, 1963.