Gaya APA

Roskin, M, G. (1989). Countries and concepts : an introduction to comparative polities (3rd ed). Englewood Cliffs, NJ: Prentice-Hall.

Gaya MLA

Roskin, Michael, G.. "Countries and concepts : an introduction to comparative polities". 3rd ed Englewood Cliffs, NJ: Prentice-Hall, 1989. Text.