Cita APA

Clarke, R. 1., & Clarke, R. 1. (1997). Global environment outlook: An overview. Nairobi, Kenya: United Nations Environment Programme.

Citación estilo Chicago

Clarke, Robin 1937, y Robin 1937 Clarke. Global Environment Outlook: An Overview. Nairobi, Kenya: United Nations Environment Programme, 1997.

Cita MLA

Clarke, Robin 1937, y Robin 1937 Clarke. Global Environment Outlook: An Overview. Nairobi, Kenya: United Nations Environment Programme, 1997.