Gaya APA
Economics: Principles, Problems, and Policies. (2005).
New York:
[s.n.].
Gaya Chicago
Economics: Principles, Problems, and Policies.
.
New York:
[s.n.],
2005.
Text.
Gaya MLA
Economics: Principles, Problems, and Policies.
.
New York:
[s.n.],
2005.
Text.
Gaya Turabian
Economics: Principles, Problems, and Policies.
New York:
[s.n.],
2005.
Print.