Cita APA (7a ed.)

Siegel, A. M., & Etzkorn, I. (2013). Simple (First Edition.). Twelve.

Cita Chicago Style (17a ed.)

Siegel, Alan M., y Irene Etzkorn. Simple. First Edition. New York: Twelve, 2013.

Cita MLA (8a ed.)

Siegel, Alan M., y Irene Etzkorn. Simple. First Edition. Twelve, 2013.