Sources

100 Greatest Sports Heroes, by Mac Davis, Grosset & Dunlap Publishers, 1954 and 1958 (page 45, with drawing of Frank in wrestling pose).

From Milo to Londos, by Nat Fleischer, mentioned throughout the book.

A Pictorial History of Wrestling, by Graeme Kent, Spring Books, 1968.

From Gotch to Gable: A History of Iowa Wrestling, by Mike Chapman, University of Iowa Press (5 Photos of Gotch).

Gotch: World's Greatest Wrestler, by Mike Chapman (38 Photos of various wrestlers)

Gotch: An American Hero, an historical novel by Mike Chapman, Culture House books, 1999, 279 pages (4 photos of Frank, on the front and back cover).