Cita APA (7a ed.)

Gray, J. C., Campbell, D., Thomas, P. A., & Hovenkamp, H. (1997). The nature and sources of the law. Ashgate [etc.].

Cita Chicago Style (17a ed.)

Gray, John Chipman, David Campbell, Philip A. Thomas, y Herbert Hovenkamp. The Nature and Sources of the Law. Aldershot [etc.]: Ashgate [etc.], 1997.

Cita MLA (9a ed.)

Gray, John Chipman, et al. The Nature and Sources of the Law. Ashgate [etc.], 1997.