APA (7th ed.) Citation

Locklin, D. P. (1972). Economics of transportation (7. ed., 6. printing.). Irwin.

Chicago Style (17th ed.) Citation

Locklin, D. Philip. Economics of Transportation. 7. ed., 6. printing. Homewood, Ill: Irwin, 1972.

MLA (9th ed.) Citation

Locklin, D. Philip. Economics of Transportation. 7. ed., 6. printing. Irwin, 1972.