Gaya APA
Robertson, David. (1988).
The Penguin dictionary of politics .
New York:
Penguin Books.
Gaya Chicago
Robertson, David.
The Penguin dictionary of politics.
New York:
Penguin Books,
1988.
Text.
Gaya MLA
Robertson, David.
The Penguin dictionary of politics.
New York:
Penguin Books,
1988.
Text.
Gaya Turabian
Robertson, David.
The Penguin dictionary of politics.
New York:
Penguin Books,
1988.
Print.