Gaya APA
Principles of Economics. (2016).
:
University of Minnesota Libraries.
Gaya Chicago
Principles of Economics.
.
:
University of Minnesota Libraries,
2016.
Electronic Resource.
Gaya MLA
Principles of Economics.
.
:
University of Minnesota Libraries,
2016.
Electronic Resource.
Gaya Turabian
Principles of Economics.
:
University of Minnesota Libraries,
2016.
Electronic Resource.