Παραπομπή APA

Polak, J. B., Heertje, A., & Heertje, A. (2001). Analytical transport economics: An international perspective. Cheltenham, U.K.: Edward Elgar.

Παραπομπή Chicago Style

Polak, Jacob B., Arnold Heertje, and Arnold Heertje. Analytical Transport Economics: An International Perspective. Cheltenham, U.K.: Edward Elgar, 2001.

Παραπομπή MLA

Polak, Jacob B., Arnold Heertje, and Arnold Heertje. Analytical Transport Economics: An International Perspective. Cheltenham, U.K.: Edward Elgar, 2001.

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