United Nations Environment Programme. (1991). Tanneries and the environment: A technical guide to reducing the environmental impact of tannery operations. United Nations Environment Programme.
Citace podle Chicago (17th ed.)United Nations Environment Programme. Tanneries and the Environment: A Technical Guide to Reducing the Environmental Impact of Tannery Operations. Paris: United Nations Environment Programme, 1991.
Citace podle MLA (9th ed.)United Nations Environment Programme. Tanneries and the Environment: A Technical Guide to Reducing the Environmental Impact of Tannery Operations. United Nations Environment Programme, 1991.
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