United Nations Environment Programme & GEMS Monitoring and Assessment Research Centre. (1991). Environmental data report (3rd ed. 1991/92.). B. Blackwell.
Citace podle Chicago (17th ed.)United Nations Environment Programme a GEMS Monitoring and Assessment Research Centre. Environmental Data Report. 3rd ed. 1991/92. Oxford, UK ; Cambridge, Mass., USA: B. Blackwell, 1991.
Citace podle MLA (8th ed.)United Nations Environment Programme a GEMS Monitoring and Assessment Research Centre. Environmental Data Report. 3rd ed. 1991/92. B. Blackwell, 1991.
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