Cita APA (7a ed.)

Friedman, J., & Posner, R. A. (2011). What caused the financial crisis. University of Pennsylvania Press.

Cita Chicago Style (17a ed.)

Friedman, Jeff, y Richard A. Posner. What Caused the Financial Crisis. Philadelphia: University of Pennsylvania Press, 2011.

Cita MLA (8a ed.)

Friedman, Jeff, y Richard A. Posner. What Caused the Financial Crisis. University of Pennsylvania Press, 2011.