APA

United States, . (1971). Water resources research: hearing before Subcommittee on Water and Power Resources, 92d Congress, 1st session, on S. 121, S. 219, and S. 2428, Oct. 13, 1971. [Washington, D.C.]: .

Chicago

United States, . 1971. Water resources research: hearing before Subcommittee on Water and Power Resources, 92d Congress, 1st session, on S. 121, S. 219, and S. 2428, Oct. 13, 1971. [Washington, D.C.]: .

Harvard

United States, . (1971). Water resources research: hearing before Subcommittee on Water and Power Resources, 92d Congress, 1st session, on S. 121, S. 219, and S. 2428, Oct. 13, 1971. [Washington, D.C.]: .

MLA

United States, . Water resources research: hearing before Subcommittee on Water and Power Resources, 92d Congress, 1st session, on S. 121, S. 219, and S. 2428, Oct. 13, 1971. [Washington, D.C.]: . 1971.