.
____. “Life Expectancy at Birth, Female (Years).” Accessed March 29, 2015. http://data.worldbank.org/indicator/SP.DYN.LE00.FE.IN/countries.
____. “Life Expectancy at Birth, Male (Years).” Accessed March 29, 2015. http://data.worldbank.org/indicator/SP.DYN.LE00.MA.IN/countries.
Wu, Ke Bin. “Sources of Income for Older Americans, 2012.” Washington, DC: AARP Public Policy Institute, December 2013.
Wyatt, Edward. “Judge Blocks Citigroup Settlement With S.E.C.” New York Times, November 28, 2011. Accessed June 10, 2015. http://www.nytimes.com/2011/11/29/business/judge-rejects-sec-accord-with-citi.html?pagewanted=all.
Wynder, Ernst L., and Evarts A. Graham. “Tobacco Smoking as a Possible Etiologic Factor in Bronchogenic Carcinoma Study of Six Hundred and Eighty-Four Proved Cases.” Journal of the American Medical Association 143, no. 4 (May 27, 1950): 329–36.
Wynder, Ernst L., Evarts A. Graham, and Adele B. Croninger. “Experimental Production of Carcinoma with Cigarette Tar.” Cancer Research 13, no. 12 (1953): 855–64.
Young, James Harvey. The Toadstool Millionaires: A Social History of Patent Medicines in America before Federal Regulation. Princeton: Princeton University Press, 1961.
Zacks Equity Research. “Strong U.S. Auto Sales for 2013.” January 6, 2014. Accessed December 1, 2014. http://www.zacks.com/stock/news/118754/strong-us-auto-sales-for-2013.