Cita APA (7a ed.)

Lang, W. (1997). International environmental negotiations. UNITAR, IUCN, UNEP.

Cita Chicago Style (17a ed.)

Lang, Winfried. International Environmental Negotiations. Geneva: UNITAR, IUCN, UNEP, 1997.

Cita MLA (8a ed.)

Lang, Winfried. International Environmental Negotiations. UNITAR, IUCN, UNEP, 1997.