Gaya APA

Shepsle, T, J, L, ;, B, G, :, K, A. (2006). American Government : power and purpose (9). New York: Norton.

Gaya MLA

Shepsle, Theodore, J., Lowi, ;, Benjamin, Ginsberg, :, Kenneth, A.. "American Government : power and purpose". 9 New York: Norton, 2006. Text.