Friedman, Thomas (June 24, 2012). "The Rise of Popularism". The New York Times. No. Sunday Review. New York, N.Y. The New York Times. p. SR13. Archived from the original on March 31, 2015. Retrieved September 17, 2015.
Bollinger, Michael (June 2011). "The Means to Differentiation"(PDF). Strategic Finance. 92 (12): 21. Archived(PDF) from the original on July 31, 2017. Retrieved May 26, 2018.
Friedman, Thomas (June 24, 2012). "The Rise of Popularism". The New York Times. No. Sunday Review. New York, N.Y. The New York Times. p. SR13. Archived from the original on March 31, 2015. Retrieved September 17, 2015.
Bollinger, Michael (June 2011). "The Means to Differentiation"(PDF). Strategic Finance. 92 (12): 21. Archived(PDF) from the original on July 31, 2017. Retrieved May 26, 2018.