Cita APA (7a ed.)

Gran Bretaña & Hughes, D. J. (1997). Environmental law ([3rd ed.].). Butterworths.

Cita Chicago Style (17a ed.)

Gran Bretaña y D. J. Hughes. Environmental Law. [3rd ed.]. London [etc.]: Butterworths, 1997.

Cita MLA (9a ed.)

Gran Bretaña y D. J. Hughes. Environmental Law. [3rd ed.]. Butterworths, 1997.