Gaya APA
BYRNS, R, T., Stone, G, W. (1981).
Economics (Second Edition).
Glenview, Illinois:
Scott, Foresman and Company.
Gaya MLA
BYRNS, Ralph, T.., Stone, Gerald, W..
"Economics".
Second Edition
Glenview, Illinois:
Scott, Foresman and Company,
1981.
Text.