Gaya APA
Essential of Economics. (2011).
Amerika:
MCGraw Hill Book Company.
Gaya Chicago
Essential of Economics.
Ed. 8.
Amerika:
MCGraw Hill Book Company,
2011.
.
Gaya MLA
Essential of Economics.
Ed. 8.
Amerika:
MCGraw Hill Book Company,
2011.
.
Gaya Turabian
Essential of Economics.
Amerika:
MCGraw Hill Book Company,
2011.
.