Gaya APA
Greenstein, F, I., Polsb, N, W. (1975).
Political Science Scope and Theory .
Massachusettes:
Addison-Wesley Publishing Company.
Gaya MLA
Greenstein, Fred, I.., Polsb, Nelson, W..
"Political Science Scope and Theory".
Massachusettes:
Addison-Wesley Publishing Company,
1975.
Referensi.