Não informado. (1976). AASHTO Quarterly. American Association of State Highway and Transportation Officials.
Chicago-referens (17:e uppl.)Não informado. AASHTO Quarterly. Washington: American Association of State Highway and Transportation Officials, 1976.
MLA-referens (8:e uppl.)Não informado. AASHTO Quarterly. American Association of State Highway and Transportation Officials, 1976.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.