Παραπομπή APA

Locklin, D. P. (1972). Economics of Transportation (7th ed.). Richard D. Irwin.

Παραπομπή Chicago Style

Locklin, D. Philiph. Economics of Transportation. 7th ed. Illiniois: Richard D. Irwin, 1972.

Παραπομπή MLA

Locklin, D. Philiph. Economics of Transportation. 7th ed. Richard D. Irwin, 1972.