Cita APA (7th ed.)

National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, United States. Federal Highway Administration, American Association of State Highway and Transportation Officials, & Bullard, D. L. (2006). Aesthetic concrete barrier design. Transportation Research Board.

Cita Chicago (17th ed.)

National Cooperative Highway Research Program, National Research Council (U.S.). Transportation Research Board, United States. Federal Highway Administration, American Association of State Highway and Transportation Officials, i D. Lance Bullard. Aesthetic Concrete Barrier Design. Washington, D.C: Transportation Research Board, 2006.

Cita MLA (9th ed.)

National Cooperative Highway Research Program, et al. Aesthetic Concrete Barrier Design. Transportation Research Board, 2006.

Atenció: Aquestes cites poden no estar 100% correctes.