Gaya APA
Economics: A General Introduction. (1988).
Illinois:
Irwin.
Gaya Chicago
Economics: A General Introduction.
Ed.5.
Illinois:
Irwin,
1988.
.
Gaya MLA
Economics: A General Introduction.
Ed.5.
Illinois:
Irwin,
1988.
.
Gaya Turabian
Economics: A General Introduction.
Illinois:
Irwin,
1988.
.