Παραπομπή σε μορφή APA (7η εκδ.)

United States. Environmental Protection Agency. Office of the Administrator. (1991). Environmental investments: The cost of a clean environment : report of the administrator, Environmental Protection Agency. Island Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

United States. Environmental Protection Agency. Office of the Administrator. Environmental Investments: The Cost of a Clean Environment : Report of the Administrator, Environmental Protection Agency. Washington: Island Press, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

United States. Environmental Protection Agency. Office of the Administrator. Environmental Investments: The Cost of a Clean Environment : Report of the Administrator, Environmental Protection Agency. Island Press, 1991.