APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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