United States. Congress. House. Committee on Public Works. Special Subcommittee on the Federal-Aid Highway Program. (1968). Highway safety, design, and operations; freeway signing and related geometrics: Hearings, Ninetieth Congress, second session. U.S. Govt. Print. Off..
Cita Chicago Style (17a ed.)United States. Congress. House. Committee on Public Works. Special Subcommittee on the Federal-Aid Highway Program. Highway Safety, Design, and Operations; Freeway Signing and Related Geometrics: Hearings, Ninetieth Congress, Second Session. Washington: U.S. Govt. Print. Off., 1968.
Cita MLA (8a ed.)United States. Congress. House. Committee on Public Works. Special Subcommittee on the Federal-Aid Highway Program. Highway Safety, Design, and Operations; Freeway Signing and Related Geometrics: Hearings, Ninetieth Congress, Second Session. U.S. Govt. Print. Off., 1968.