Gaya APA
Amacher, Ryan C., Ulbrich, Holley H.. (1992).
Principles of economics, 5th ed. (5th ed.).
Cincinnati:
Southwestern Publishing.
Gaya Chicago
Amacher, Ryan C., Ulbrich, Holley H..
Principles of economics, 5th ed..
5th ed.
Cincinnati:
Southwestern Publishing,
1992.
Text.
Gaya MLA
Amacher, Ryan C., Ulbrich, Holley H..
Principles of economics, 5th ed..
5th ed.
Cincinnati:
Southwestern Publishing,
1992.
Text.
Gaya Turabian
Amacher, Ryan C., Ulbrich, Holley H..
Principles of economics, 5th ed..
5th ed.
Cincinnati:
Southwestern Publishing,
1992.
Print.