United States International Environmental Referral Center & United States. Environmental Protection Agency. Office of Management and Agency Services. (1979). U.S directory of environmental sources (3d ed.). Environmental Protection Agency, Assistant Administrator for Planning and Management, Office of Management and Agency Services.
Chicago Style (17th ed.) CitationUnited States International Environmental Referral Center and United States. Environmental Protection Agency. Office of Management and Agency Services. U.S Directory of Environmental Sources. 3d ed. Washington: Environmental Protection Agency, Assistant Administrator for Planning and Management, Office of Management and Agency Services, 1979.
MLA (9th ed.) CitationUnited States International Environmental Referral Center and United States. Environmental Protection Agency. Office of Management and Agency Services. U.S Directory of Environmental Sources. 3d ed. Environmental Protection Agency, Assistant Administrator for Planning and Management, Office of Management and Agency Services, 1979.