- The New York Times
January 17, 2014
- The New York Times
July 5, 2013
- The Boston Globe
November 17, 2012
- The New York Times
July 14, 2012
- The Boston Globe
September 17, 2011
- Freakonomics
August 1, 2008
- Freakonomics
July 30, 2008
- Freakonomics
July 28, 2008