Gaya APA

Thoman, R, S., Corbin, P, B. (1974). The geography of economic activity (3rd. ed.). New York: McGraw-Hill Book Co..

Gaya MLA

Thoman, Richard, S., Corbin, Peter, B.. "The geography of economic activity". 3rd. ed. New York: McGraw-Hill Book Co., 1974. Text.