APA

United States, . (1950). Transportation study: hearings before subcommittee, 81st Congress, 2d session, on transportation problems, Feb. 27-Mar. 3, 1950. [Washington, D.C.]: .

Chicago

United States, . 1950. Transportation study: hearings before subcommittee, 81st Congress, 2d session, on transportation problems, Feb. 27-Mar. 3, 1950. [Washington, D.C.]: .

Harvard

United States, . (1950). Transportation study: hearings before subcommittee, 81st Congress, 2d session, on transportation problems, Feb. 27-Mar. 3, 1950. [Washington, D.C.]: .

MLA

United States, . Transportation study: hearings before subcommittee, 81st Congress, 2d session, on transportation problems, Feb. 27-Mar. 3, 1950. [Washington, D.C.]: . 1950.