APA (7th ed.) Citation

United Nations Environment Programme. (1987). INFOTERRA: A world directory of environmental expertise ([6th ed.].). United Nations Environment Programme.

Chicago Style (17th ed.) Citation

United Nations Environment Programme. INFOTERRA: A World Directory of Environmental Expertise. [6th ed.]. Nairobi: United Nations Environment Programme, 1987.

MLA (9th ed.) Citation

United Nations Environment Programme. INFOTERRA: A World Directory of Environmental Expertise. [6th ed.]. United Nations Environment Programme, 1987.