Gaya APA
Principles of Macro economics. (2007).
New York:
[s.n.].
Gaya Chicago
Principles of Macro economics.
3.
New York:
[s.n.],
2007.
Text.
Gaya MLA
Principles of Macro economics.
3.
New York:
[s.n.],
2007.
Text.
Gaya Turabian
Principles of Macro economics.
New York:
[s.n.],
2007.
Print.