APA

United States, . (1971). Snowmobiles and other off-road vehicles: hearing before Subcommittee on Parks and Recreation, 92d Congress, 1st session, on study of effects of rapidly expanding use of all terrain vehicles on public lands, May 21, 1971. [Washington, D.C.]: .

Chicago

United States, . 1971. Snowmobiles and other off-road vehicles: hearing before Subcommittee on Parks and Recreation, 92d Congress, 1st session, on study of effects of rapidly expanding use of all terrain vehicles on public lands, May 21, 1971. [Washington, D.C.]: .

Harvard

United States, . (1971). Snowmobiles and other off-road vehicles: hearing before Subcommittee on Parks and Recreation, 92d Congress, 1st session, on study of effects of rapidly expanding use of all terrain vehicles on public lands, May 21, 1971. [Washington, D.C.]: .

MLA

United States, . Snowmobiles and other off-road vehicles: hearing before Subcommittee on Parks and Recreation, 92d Congress, 1st session, on study of effects of rapidly expanding use of all terrain vehicles on public lands, May 21, 1971. [Washington, D.C.]: . 1971.