United Nations Environment Programme. (1991). Register of international treaties and other agreements in the field of the environment. UNEP.
Цитирование в стиле Чикаго (17-е изд.)United Nations Environment Programme. Register of International Treaties and Other Agreements in the Field of the Environment. Nairobi: UNEP, 1991.
Цитирование MLA (8-е изд.)United Nations Environment Programme. Register of International Treaties and Other Agreements in the Field of the Environment. UNEP, 1991.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.