APA (7e ed.) Bronvermelding

Byrns, R. T., & Stone, G. W. (1989). Economics (4th ed.). Scott, Foresman.

Chicago (17e ed.) Bronvermelding

Byrns, Ralph T., en Gerald W. Stone. Economics. 4th ed. Glenview, Ill.: Scott, Foresman, 1989.

MLA (8e ed.) Bronvermelding

Byrns, Ralph T., en Gerald W. Stone. Economics. 4th ed. Scott, Foresman, 1989.