Não informado. (1966). Summary of progress. National Cooperative Highway Research Program.
Chicago-Zitierstil (17. Ausg.)Não informado. Summary of Progress. Washington: National Cooperative Highway Research Program, 1966.
MLA-Zitierstil (8. Ausg.)Não informado. Summary of Progress. National Cooperative Highway Research Program, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.