Não informado. (1974). American Highway and Transportation Monthly. American Association of State Highway and Transportation Officials.
Citação do estilo Chicago (17ª ed.)Não informado. American Highway and Transportation Monthly. Washington: American Association of State Highway and Transportation Officials, 1974.
Citação MLA (8ª ed.)Não informado. American Highway and Transportation Monthly. American Association of State Highway and Transportation Officials, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.