APA

United States, . (1957). National Wilderness Preservation Act: hearings, 85th Congress, 1st session on S. 1176, June 19 and 20, 1957. [Washington, D.C.]: .

Chicago

United States, . 1957. National Wilderness Preservation Act: hearings, 85th Congress, 1st session on S. 1176, June 19 and 20, 1957. [Washington, D.C.]: .

Harvard

United States, . (1957). National Wilderness Preservation Act: hearings, 85th Congress, 1st session on S. 1176, June 19 and 20, 1957. [Washington, D.C.]: .

MLA

United States, . National Wilderness Preservation Act: hearings, 85th Congress, 1st session on S. 1176, June 19 and 20, 1957. [Washington, D.C.]: . 1957.