APA

United States, United States, . (1990). Energy casebook. [Washington, D.C.]: .

Chicago

United States, United States, . 1990. Energy casebook. [Washington, D.C.]: .

Harvard

United States, United States, . (1990). Energy casebook. [Washington, D.C.]: .

MLA

United States, United States, . Energy casebook. [Washington, D.C.]: . 1990.