Several books have addressed the history of New Philadelphia and its founder, including:

D. W. Ensign, Atlas Map of Pike County, Illinois.
Andreas, Lyter & Co., Davenport, Iowa, 1872.

Charles C.Chapman, History of Pike County, Illinois.
Charles C. Chapman & Co., Chicago, Illinois, 1880.

Helen McWorter Simpson, Makers of History.
Laddie B. Warren, Evansville, Indiana, 1981.

Grace E. Matteson, "Free Frank" McWorter and the "Ghost Town" of New Philadelphia.
Pike County Historical Society, Pittsfield, 1964.

Juliet E. K. Walker, Free Frank: A Black Pioneer on the Antebellum Frontier.
University Press of Kentucky, Lexington, 1983 (reissue edition 1995).

Paul A. Shackel, New Philadelphia: An Archaeology of Race in the Heartland. University of California Press, Berkeley, 2010.

Christopher C. Fennell, Broken Chains and Subverted Plans: Ethnicity, Race, and Commodities. University Press of Florida, Gainesville, 2017.

Gerald A. McWorter and Kate Williams-McWorter, New Philadelphia. Path Press, Evanston, 2018.

Follow the links at the left for additional sources. More listings coming soon!