APA (7e ed.) Bronvermelding

Amacher, R. C., & Ulbrich, H. H. (1995). Economic principles & policy (6th ed.). South-Western College.

Chicago (17e ed.) Bronvermelding

Amacher, Ryan C., en Holley H. Ulbrich. Economic Principles & Policy. 6th ed. Cincinnati: South-Western College, 1995.

MLA (9e ed.) Bronvermelding

Amacher, Ryan C., en Holley H. Ulbrich. Economic Principles & Policy. 6th ed. South-Western College, 1995.