Cita APA

Tolba, M. K. (1992). The World environment 1972-1992: Two decades of challenge. Published by Chapman & Hall on behalf of the United Nations Environment Programme.

Citación estilo Chicago

Tolba, Mostafa Kamal. The World Environment 1972-1992: Two Decades of Challenge. London: Published by Chapman & Hall on behalf of the United Nations Environment Programme, 1992.

Cita MLA

Tolba, Mostafa Kamal. The World Environment 1972-1992: Two Decades of Challenge. Published by Chapman & Hall on behalf of the United Nations Environment Programme, 1992.