MLA

Dahl, Robert A., Ian Shapiro, and José Antônio Cheibub. The Democracy Sourcebook. Cambridge, Mass.: MIT Press, 2003.

APA

Dahl, R. A., Shapiro, I., & Cheibub, J. Antônio. (2003). The democracy sourcebook. Cambridge, Mass.: MIT Press.

Chicago

Dahl, Robert A., Ian Shapiro, and José Antônio Cheibub. The Democracy Sourcebook. Cambridge, Mass.: MIT Press, 2003.