Gaya APA
Greenberg, Edward S. (1968).
The american political system .
USA:
Little, Brown and Company.
Gaya Chicago
Greenberg, Edward S.
The american political system.
USA:
Little, Brown and Company,
1968.
Text.
Gaya MLA
Greenberg, Edward S.
The american political system.
USA:
Little, Brown and Company,
1968.
Text.
Gaya Turabian
Greenberg, Edward S.
The american political system.
USA:
Little, Brown and Company,
1968.
Print.