Cita APA (7a ed.)

Lang, W., Neuhold, H., & Zemanek, K. (1991). Environmental protection and international law. Graham & Trotman.

Cita Chicago Style (17a ed.)

Lang, Winfried, Hanspeter Neuhold, y Karl Zemanek. Environmental Protection and International Law. London [etc.]: Graham & Trotman, 1991.

Cita MLA (9a ed.)

Lang, Winfried, et al. Environmental Protection and International Law. Graham & Trotman, 1991.