Gaya APA

Suyantiningsih, ., Ladd, E, C. (1989). The American Polity : The People and Their Covernment (3 rd ed). Oxford: W.W.Northon & Company.

Gaya MLA

Suyantiningsih, ., Ladd, Everett, CarllMaterial. "The American Polity : The People and Their Covernment". 3 rd ed Oxford: W.W.Northon & Company, 1989. Text.