Robbins, R. M., & Postgate, R. (1961). XXXIVth International Congress Copenhagen 1961: Passenger fares, a consideration of the economic aspects of alternative fares structures. Brussels: International Union of Public Transport.
Παραπομπή Chicago StyleRobbins, R. M., and R. Postgate. XXXIVth International Congress Copenhagen 1961: Passenger Fares, a Consideration of the Economic Aspects of Alternative Fares Structures. Brussels: International Union of Public Transport, 1961.
Παραπομπή MLARobbins, R. M., and R. Postgate. XXXIVth International Congress Copenhagen 1961: Passenger Fares, a Consideration of the Economic Aspects of Alternative Fares Structures. Brussels: International Union of Public Transport, 1961.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.