APA

United States, . (2013). Past, present and future of the federal helium program; and H.R. 527, Responsible Helium Administration and Stewardship Act: oversight and legislative hearing before the Committee on Natural Resources, U.S. House of Representatives, One Hundred Thirteenth Congress, first session, Thursday, February 14, 2013. Washington: U.S. Government Printing Office.

Chicago

United States, . 2013. Past, present and future of the federal helium program; and H.R. 527, Responsible Helium Administration and Stewardship Act: oversight and legislative hearing before the Committee on Natural Resources, U.S. House of Representatives, One Hundred Thirteenth Congress, first session, Thursday, February 14, 2013. Washington: U.S. Government Printing Office.

Harvard

United States, . (2013). Past, present and future of the federal helium program; and H.R. 527, Responsible Helium Administration and Stewardship Act: oversight and legislative hearing before the Committee on Natural Resources, U.S. House of Representatives, One Hundred Thirteenth Congress, first session, Thursday, February 14, 2013. Washington: U.S. Government Printing Office.

MLA

United States, . Past, present and future of the federal helium program; and H.R. 527, Responsible Helium Administration and Stewardship Act: oversight and legislative hearing before the Committee on Natural Resources, U.S. House of Representatives, One Hundred Thirteenth Congress, first session, Thursday, February 14, 2013. Washington: U.S. Government Printing Office. 2013.