Gaya APA

C., E, , R., Buchanan, O, R. (1961). Industrial Activity & Economic Geography . New York: Jhon Wiley & Sons, Inc..

Gaya MLA

C., Estall, , R.., Buchanan, Ogilvie, R.O.. "Industrial Activity & Economic Geography". New York: Jhon Wiley & Sons, Inc., 1961. Text.