APA

United States, . (1970). Tar sands: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, on S. 581 [and] S. 582, July 13, 1970. [Washington, D.C.]: .

Chicago

United States, . 1970. Tar sands: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, on S. 581 [and] S. 582, July 13, 1970. [Washington, D.C.]: .

Harvard

United States, . (1970). Tar sands: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, on S. 581 [and] S. 582, July 13, 1970. [Washington, D.C.]: .

MLA

United States, . Tar sands: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, on S. 581 [and] S. 582, July 13, 1970. [Washington, D.C.]: . 1970.