Willis, D. E. (1971). Urban mass transportation: A bibliography. Dep. of Transportation, Office of Administrative Operations, Libr. Services Division.
Chicago-Zitierstil (17. Ausg.)Willis, Dawn E. Urban Mass Transportation: A Bibliography. Washington: Dep. of Transportation, Office of Administrative Operations, Libr. Services Division, 1971.
MLA-Zitierstil (9. Ausg.)Willis, Dawn E. Urban Mass Transportation: A Bibliography. Dep. of Transportation, Office of Administrative Operations, Libr. Services Division, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.