American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. (2014). 2015 interim revisions to Standard specifications for structural supports for highway signs, luminaires, and traffic signals (Sixth edition 2013.). American Association of State Highway and Transportation Officials.
Cita Chicago Style (17a ed.)American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. 2015 Interim Revisions to Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. Sixth edition 2013. Washington, D.C.: American Association of State Highway and Transportation Officials, 2014.
Cita MLA (8a ed.)American Association of State Highway and Transportation Officials. Subcommittee on Bridges and Structures. 2015 Interim Revisions to Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. Sixth edition 2013. American Association of State Highway and Transportation Officials, 2014.