APA

United States, . (2006). Future of federal coal: status, availability, and impact of technological advances in using coal to create alternative energy resources : oversight hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Resources, U.S. House of Representatives, One Hundred Ninth Congress, second session, Thursday, May 4, 2006. Washington: U.S. Government Printing Office.

Chicago

United States, . 2006. Future of federal coal: status, availability, and impact of technological advances in using coal to create alternative energy resources : oversight hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Resources, U.S. House of Representatives, One Hundred Ninth Congress, second session, Thursday, May 4, 2006. Washington: U.S. Government Printing Office.

Harvard

United States, . (2006). Future of federal coal: status, availability, and impact of technological advances in using coal to create alternative energy resources : oversight hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Resources, U.S. House of Representatives, One Hundred Ninth Congress, second session, Thursday, May 4, 2006. Washington: U.S. Government Printing Office.

MLA

United States, . Future of federal coal: status, availability, and impact of technological advances in using coal to create alternative energy resources : oversight hearing before the Subcommittee on Energy and Mineral Resources of the Committee on Resources, U.S. House of Representatives, One Hundred Ninth Congress, second session, Thursday, May 4, 2006. Washington: U.S. Government Printing Office. 2006.