APA (7th ed.) Citation

National Research Council (U.S.). Highway Research Board. (1971). Design of sign supports and structures: 6 reports. National Academy of Science - National Research Council.

Chicago Style (17th ed.) Citation

National Research Council (U.S.). Highway Research Board. Design of Sign Supports and Structures: 6 Reports. Washington, D.C: National Academy of Science - National Research Council, 1971.

MLA (8th ed.) Citation

National Research Council (U.S.). Highway Research Board. Design of Sign Supports and Structures: 6 Reports. National Academy of Science - National Research Council, 1971.