APA

United States, . (1972). Environmental Protection Agency: a progress report, December 1970-June 1972. Washington: [For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Chicago

United States, . 1972. Environmental Protection Agency: a progress report, December 1970-June 1972. Washington: [For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

Harvard

United States, . (1972). Environmental Protection Agency: a progress report, December 1970-June 1972. Washington: [For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA

United States, . Environmental Protection Agency: a progress report, December 1970-June 1972. Washington: [For sale by the Supt. of Docs., U.S. Govt. Print. Off.]. 1972.