Não informado. Transportation: Current literature. U.S. Department of Transportation.
Chicago-Zitierstil (17. Ausg.)Não informado. Transportation: Current Literature. Washington: U.S. Department of Transportation.
MLA-Zitierstil (8. Ausg.)Não informado. Transportation: Current Literature. U.S. Department of Transportation.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.