Here are key sources for further study

Campaign pamphlets & periodicals

• California League Against Sinclairism. Upton Sinclair Attacks all Churches , 1934.
• EPIC News , Dec. 1933-Sept. 1947.
• National EPIC Magazine, 1936.
• Pickerill, Thomas Edwin. I, assemblyman from Orange County, and how I supported Upton Sinclair. (74th Assembly District) 1934
• Sinclair, Upton. EPIC Answers How to End Poverty in California.1934
• Sinclair, Upton. EPIC Plan for California. 1934
• Sinclair, Upton. I, Governor of California, And How I Ended Poverty, A True Story of the Future, 1933
• Sinclair, Upton. Immediate EPIC, The Final Statement of the Plan, 1934.
• Sinclair, Upton. We, the People of America, and How We End Poverty, A True Story. 1935

Books

• Arthur, Anthony. Radical Innocent : Upton Sinclair New York : Random House, 2006.
• Burke, Robert E. Olson's New Deal for California . Berkeley: UC Press, 1953.
• Coodley, Lauren, Upton Sinclair: California Socialist, Celebrity Intellectual. University of Nebraska Press, 2013
• Coodley, Lauren, ed. The Land of Orange Groves and Jails: Upton Sinclair's California . Berkeley: Heyday Books, 2004
• Harris, Leon A. Upton Sinclair, American Rebel New York : Crowell, 1975
• Laslett, John H.M. Sunshine Was Never Enough: Los Angeles Workers, 1880-2010 Berkeley: University of California Press, 2012
• Mattson, Kevin. Upton Sinclair and the other American century Hoboken, N.J. : John Wiley & Sons, 2006.
• Mitchell, Greg. The Campaign of the Century: Upton Sinclair’s Race for Governor of California and the Birth of Media Politics New York: Random House, Inc., 1992.
• Rogin, Michael Paul and John L. Shover. Political Change in California: Critical Elections and Social Movements, 1890- 1966 , 1970
• Sinclair, Upton. Autobiography .
• Sinclair, Upton. I, Candidate For Governor : And How I Got Licked; Introduction By James N. Gregory Berkeley : University of California Press, 1994
• Starr, Kevin. Endangered dreams : the Great Depression in California New York : Oxford University Press, 1996

Articles

• Antognini, Richard. "The Role of A.P. Giannini in the 1934 Calfifornia Gubernatorial Election," Southern California Quarterly 57, no. 1(1975), 53-86.
• Apostol, Jane. . "From Salon to Soap-box: Kate Crane Gartz, Parlor Provocateur." Southern California Quarterly 89, no. 4 (2007), 373-390.
• Blake, Fay M. and Morton H. Newman. "Upton Sinclair's EPIC Campaign," California History 1984 63(4), 305-312.
• Gregory, James N. "Upton Sinclair’s 1934 EPIC Campaign: Anatomy of a Political Movement," LABOR: Studies in Working-class History (December, 2015)
• Grenier, Judson. "Upton Sinclair: The Road to California." Southern California Quarterly 56, no. 4 (1974.), 325-336.
• Larsen, Charles E. "The Epic Campaign of 1934," Pacific Historical Review , (XXVII) May 1958, 127-148.
• Leader, Leonard. "Upton Sinclair's EPIC Switch: A Dilemma for American Socialists," Southern California Quarterly , (LXII)4 Winter 1980, 361-381.
• Lepore, Jill. "The Lie Factory: How Politics Became a Business," New Yorker, September 24, 2012
• McEdwards, Mary. "Upton Sinclair, California's EPIC Prophet," University of Wyoming Publications , XXXIV(10), August 7, 1968, 180-203.
• McIntosh, Clarence F. "The Significance of the End-Poverty-in-California Movement," The Pacific Historian , (27)4, Winter 1983, 20-25.
• Mitchell, Greg. "Summer of '34, Part I: The Democratic Candidate," Working Papers Magazine , 9(6),November/December 1982, 28-36.
• Mitchell, Greg. "Summer of '34, Part II:Showdown in California," Working Papers Magazine , 10(1), January/February 1983, 18-27.
• Posner, Russell M. "A.P. Giannini and the 1934 Campaign in California," Historical Society of Southern California Quarterly, 39(2) June 1957.
• Rising, George G. "An EPIC Endeavor: Upton Sinclair's 1934 California Gubernatorial Campaign." Southern California Quarterly 79, no. 1 (1997.),101-124.
• Singer, Donald L. "Upton Sinclair and the California Gubernatorial Campaign of 1934," Southern California Quarterly , 56(4) 1974, 375-406.
• Soderbergh, Peter A. . "Upton Sinclair and Hollywood" Midwest Quarterly 12, no. 1 (1970), 173-191.
• Tice Moore, James. "Depression images: Subsistence Homesteads, "Production-For-Use," and King Vidor's Our Daily Bread." Midwest Quarterly 26, no. 1(1984), 24-34
• Zanger, Martin. "Upton Sinclair as California's Socialist Candidate for Congress, 1920," Southern California Quarterly , 56(4), 359-379.

Dissertations/theses

• Albrecht, Alfred James. A Rhetorical Study of Upton Sinclair's 1934 Campaign for Governor of California . Phd diss. Indiana University, 1966.
• Chinn, Ronald. Democratic Party Politics in California, 1920-1956 . PhD. diss. UCB, 1956.
• Delmatier, Royce Deems. The Rebirth of the Democratic Party in California, 1928-1938. PhD. diss. UCB, 1958.
• Larsen, Charles Edward. The "EPIC" Movement in California Politics, 1933-1936 , PhD. diss. UCB, 1936
• McIntosh, Clarence Frederic. Upton Sinclair and the Epic Movement, 1933-1936 , PhD. diss. Stanford University, 1955.
• Sitton, Thomas Joseph. Urban Politics and Reform in New Deal Los Angeles: The Recall of Mayor Frank L. Shaw. PhD. diss. UC Riverside, 1983.

Archival Collections

• Elmer Belt Upton Sinclair collection, Occidental College Library Special Collections
• Reuben Borough papers, UCLA special collections library
• Teggart, Richard Victor. Scrapbook of Republican Campaign literature for the 1934 gubernatorial election.
• Upton Sinclair Papers, Lilly Library, Indiana University