American Association of State Highway Officials. (1973). Construction manual for highway bridges and incidental structures. American Association of State Highway Officials.
Cita Chicago (17th ed.)American Association of State Highway Officials. Construction Manual for Highway Bridges and Incidental Structures. Washington, D.C: American Association of State Highway Officials, 1973.
Cita MLA (9th ed.)American Association of State Highway Officials. Construction Manual for Highway Bridges and Incidental Structures. American Association of State Highway Officials, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.