Gaya APA
Economics Essentials: A Core Approach. (1969).
New York:
Houghton Mifflin Company.
Gaya Chicago
Economics Essentials: A Core Approach.
.
New York:
Houghton Mifflin Company,
1969.
.
Gaya MLA
Economics Essentials: A Core Approach.
.
New York:
Houghton Mifflin Company,
1969.
.
Gaya Turabian
Economics Essentials: A Core Approach.
New York:
Houghton Mifflin Company,
1969.
.