American Association of State Highway and Transportation Officials, & American Association of State Highway and Transportation Officials. (1989). Guide specifications for structural design of sound barriers, 1989 (1. edition.). Washington, D.C.: AASHTO.
Chicago Style CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Guide Specifications for Structural Design of Sound Barriers, 1989. 1. edition. Washington, D.C.: AASHTO, 1989.
MLA CitationAmerican Association of State Highway and Transportation Officials, and American Association of State Highway and Transportation Officials. Guide Specifications for Structural Design of Sound Barriers, 1989. 1. edition. Washington, D.C.: AASHTO, 1989.