Gaya APA
Purkitt, Helen E.. (2010).
Annual Editions : World Politics, Thirtieth Edition (Ed. 30).
Amerika:
Mc Graw Hill.
Gaya Chicago
Purkitt, Helen E..
Annual Editions : World Politics, Thirtieth Edition.
Ed. 30
Amerika:
Mc Graw Hill,
2010.
Text.
Gaya MLA
Purkitt, Helen E..
Annual Editions : World Politics, Thirtieth Edition.
Ed. 30
Amerika:
Mc Graw Hill,
2010.
Text.
Gaya Turabian
Purkitt, Helen E..
Annual Editions : World Politics, Thirtieth Edition.
Ed. 30
Amerika:
Mc Graw Hill,
2010.
Print.