Coughlin, Cletus C. and Ott, Lesli S. "What Do You Get for "Sixteen Tons"?," in Federal Reserve Bank of St. Louis. "December 2007," National Economic Trends (December 2007) : 1-1. https://fraser.stlouisfed.org/title/870/item/599616/toc/578854 , accessed on May 3, 2024.