APA (7e ed.) Bronvermelding

United Nations Environment Programme & GEMS Monitoring and Assessment Research Centre. (1991). Environmental data report (3rd ed. 1991/92.). B. Blackwell.

Chicago (17e ed.) Bronvermelding

United Nations Environment Programme en GEMS Monitoring and Assessment Research Centre. Environmental Data Report. 3rd ed. 1991/92. Oxford, UK ; Cambridge, Mass., USA: B. Blackwell, 1991.

MLA (8e ed.) Bronvermelding

United Nations Environment Programme en GEMS Monitoring and Assessment Research Centre. Environmental Data Report. 3rd ed. 1991/92. B. Blackwell, 1991.