APA

United States, . (1960). Conservation of helium: hearings, 86th Congress, 2d session, on H.R. 10548 and S. 3376, June 1, and 15, 1960. [Washington, D.C.]: .

Chicago

United States, . 1960. Conservation of helium: hearings, 86th Congress, 2d session, on H.R. 10548 and S. 3376, June 1, and 15, 1960. [Washington, D.C.]: .

Harvard

United States, . (1960). Conservation of helium: hearings, 86th Congress, 2d session, on H.R. 10548 and S. 3376, June 1, and 15, 1960. [Washington, D.C.]: .

MLA

United States, . Conservation of helium: hearings, 86th Congress, 2d session, on H.R. 10548 and S. 3376, June 1, and 15, 1960. [Washington, D.C.]: . 1960.