APA (7e ed.) Bronvermelding

Thoman, R. S. (1974). The geography of economic activity (3rd ed.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Thoman, Richard S. The Geography of Economic Activity. 3rd ed. New York: McGraw-Hill, 1974.

MLA (9e ed.) Bronvermelding

Thoman, Richard S. The Geography of Economic Activity. 3rd ed. McGraw-Hill, 1974.