Gaya APA
Amacher, R, C., ulbrich, H, H. (1989).
Principles of macroeconomics ed. 4 .
Massachusetts:
South- Western Publishing Co.
Gaya MLA
Amacher, Ryan, C.., ulbrich, Holley, H..
"Principles of macroeconomics ed. 4".
Massachusetts:
South- Western Publishing Co,
1989.
Text.