Gaya APA

Cummings, M, C., Wise, D. (1981). Democracy under pressure : an introduction to the American political system (4th.ed.). New York: Harcout Brace Jovanovich.

Gaya MLA

Cummings, Milton, C.., Wise, David. "Democracy under pressure : an introduction to the American political system". 4th.ed. New York: Harcout Brace Jovanovich, 1981. Text.