Gaya APA
Wittkopf, C, W, E, R., tatom, D. (2004).
World Politics : Trend & Transformation (9).
Singapore:
Thomson Wadsworth.
Gaya MLA
Wittkopf, Charles, W.Kegley,, Eugene, R.., tatom, David.
"World Politics : Trend & Transformation".
9
Singapore:
Thomson Wadsworth,
2004.
Text.