Cita APA (7a ed.)

Duncan, W. R., Jancar-Webster, B., & Switky, B. (2009). World Politics in the 21st century (Student choice ed.). Houghton Mifflin Harcour.

Cita Chicago Style (17a ed.)

Duncan, W. Raymond, Barbara Jancar-Webster, y Bob Switky. World Politics in the 21st Century. Student choice ed. Boston: Houghton Mifflin Harcour, 2009.

Cita MLA (9a ed.)

Duncan, W. Raymond, et al. World Politics in the 21st Century. Student choice ed. Houghton Mifflin Harcour, 2009.