APA

United States, . (1970). Oil shale development: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, May 21, 1970. [Washington, D.C.]: .

Chicago

United States, . 1970. Oil shale development: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, May 21, 1970. [Washington, D.C.]: .

Harvard

United States, . (1970). Oil shale development: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, May 21, 1970. [Washington, D.C.]: .

MLA

United States, . Oil shale development: hearing before Subcommittee on Minerals, Materials, and Fuels, 91st Congress, 2d session, May 21, 1970. [Washington, D.C.]: . 1970.