Παραπομπή APA

Ruppenthal, K. M. (1960). Challenge to transportation. Stanford, CA: Stanford University, Graduate School of Business.

Παραπομπή Chicago Style

Ruppenthal, Karl M. Challenge to Transportation. Stanford, CA: Stanford University, Graduate School of Business, 1960.

Παραπομπή MLA

Ruppenthal, Karl M. Challenge to Transportation. Stanford, CA: Stanford University, Graduate School of Business, 1960.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.