United Nations Environment Programme. (1991). Tanneries and the environment: A technical guide to reducing the environmental impact of tannery operations. United Nations Environment Programme.
Citazione stile Chigago Style (17a edizione)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.
Citatione MLA (9a 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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.