Não informado. Transportation: Current literature. U.S. Department of Transportation.
Citação do estilo Chicago (17ª ed.)Não informado. Transportation: Current Literature. Washington: U.S. Department of Transportation.
Citação MLA (8ª ed.)Não informado. Transportation: Current Literature. U.S. Department of Transportation.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.