Não informado. Transport economics. Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
Chicago-Zitierstil (17. Ausg.)Não informado. Transport Economics. Washington: Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
MLA-Zitierstil (8. Ausg.)Não informado. Transport Economics. Interstate Commerce Commission, Bureau of Transport Economics and Statistics.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.