APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.