Παραπομπή APA

Fair, M. L., & Williams, E. W. (1959). Economics of transportation. Harper.

Παραπομπή Chicago Style

Fair, Marvine L., και Earnest W. Williams. Economics of Transportation. New York: Harper, 1959.

Παραπομπή MLA

Fair, Marvine L., και Earnest W. Williams. Economics of Transportation. Harper, 1959.