Não informado. (2002). Journal of Transportation and Statistics. US Department of Transportation, Bureau of Transportation Statistics.
Chicago-Zitierstil (17. Ausg.)Não informado. Journal of Transportation and Statistics. Washington: US Department of Transportation, Bureau of Transportation Statistics, 2002.
MLA-Zitierstil (8. Ausg.)Não informado. Journal of Transportation and Statistics. US Department of Transportation, Bureau of Transportation Statistics, 2002.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.