Gaya APA
Amos, J, O, M. (1987).
ECONOMICS CONCEPTS, ANALYSIS, AND APPLICATIONS .
Belmont, California:
Wadsworth Publishing Company.
Gaya MLA
Amos, Jr., Orley, M..
"ECONOMICS CONCEPTS, ANALYSIS, AND APPLICATIONS".
Belmont, California:
Wadsworth Publishing Company,
1987.
Textbook.