Não informado. (1922). American highways. American Association of Highway Officials.
Chicago-Zitierstil (17. Ausg.)Não informado. American Highways. Washington: American Association of Highway Officials, 1922.
MLA-Zitierstil (8. Ausg.)Não informado. American Highways. American Association of Highway Officials, 1922.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.