Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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