APA

United States, . (1957). To promote development and conservation of phosphate resources: hearing before Subcommittee on Minerals, Materials and Fuels, 85th Congress, 1st session, on S. 334, Mar. 20, 1957. [Washington, D.C.]: .

Chicago

United States, . 1957. To promote development and conservation of phosphate resources: hearing before Subcommittee on Minerals, Materials and Fuels, 85th Congress, 1st session, on S. 334, Mar. 20, 1957. [Washington, D.C.]: .

Harvard

United States, . (1957). To promote development and conservation of phosphate resources: hearing before Subcommittee on Minerals, Materials and Fuels, 85th Congress, 1st session, on S. 334, Mar. 20, 1957. [Washington, D.C.]: .

MLA

United States, . To promote development and conservation of phosphate resources: hearing before Subcommittee on Minerals, Materials and Fuels, 85th Congress, 1st session, on S. 334, Mar. 20, 1957. [Washington, D.C.]: . 1957.