Gaya APA
RUFFIN, R, J.
(1988).
PRINCIPLE OF ECONOMICS
(
3rd)
.
Glenview,Illinois:
Scott, Foresman And Company.
Gaya MLA
RUFFIN, Roy, J..
"PRINCIPLE OF ECONOMICS".
3rd
Glenview,Illinois:
Scott, Foresman And Company,
1988.
Textbook.