APA

United States, . (1970). Water resources research: hearing before Subcommittee on Water and Power Resources, 91st Congress, 2d session, on S. 3553 [and] S. 1051, July 20, 1970. [Washington, D.C.]: .

Chicago

United States, . 1970. Water resources research: hearing before Subcommittee on Water and Power Resources, 91st Congress, 2d session, on S. 3553 [and] S. 1051, July 20, 1970. [Washington, D.C.]: .

Harvard

United States, . (1970). Water resources research: hearing before Subcommittee on Water and Power Resources, 91st Congress, 2d session, on S. 3553 [and] S. 1051, July 20, 1970. [Washington, D.C.]: .

MLA

United States, . Water resources research: hearing before Subcommittee on Water and Power Resources, 91st Congress, 2d session, on S. 3553 [and] S. 1051, July 20, 1970. [Washington, D.C.]: . 1970.