APA Style
Principles of Economics. (2002).
:
Prentic Hall.
Chicago Style
Principles of Economics.
.
:
Prentic Hall,
2002.
Text.
MLA Style
Principles of Economics.
.
:
Prentic Hall,
2002.
Text.
Turabian Style
Principles of Economics.
:
Prentic Hall,
2002.
Print.