APA

United States, . (1959). Coal research: hearing before Subcommittee on Minerals, Materials, and Fuels, 86th Congress, 1st session on S. 49 and S. 1362, June 10, 1959. [Washington, D.C.]: .

Chicago

United States, . 1959. Coal research: hearing before Subcommittee on Minerals, Materials, and Fuels, 86th Congress, 1st session on S. 49 and S. 1362, June 10, 1959. [Washington, D.C.]: .

Harvard

United States, . (1959). Coal research: hearing before Subcommittee on Minerals, Materials, and Fuels, 86th Congress, 1st session on S. 49 and S. 1362, June 10, 1959. [Washington, D.C.]: .

MLA

United States, . Coal research: hearing before Subcommittee on Minerals, Materials, and Fuels, 86th Congress, 1st session on S. 49 and S. 1362, June 10, 1959. [Washington, D.C.]: . 1959.