Gaya APA
Economics. (1980).
:
Scott Foresman and Company.
Gaya Chicago
Economics.
Ed. 2.
:
Scott Foresman and Company,
1980.
.
Gaya MLA
Economics.
Ed. 2.
:
Scott Foresman and Company,
1980.
.
Gaya Turabian
Economics.
:
Scott Foresman and Company,
1980.
.