The following publications contain information about Frank Berwald:

Article with photograph: "Sergt. Frank Berwald. Sole Survivor of the Custer Massacre" • The New York Times Illustrated Magazine • 28 November 1897 • Page 26.

Photograph: "Proud Memory.–Being one of the two survivors of the Custer massacre, Frank C. Berwald, 72, holds interest of Corporal Thomas Featherstone and wife as he recalls fight." • (New York) Daily News • 24 September 1925 • Page 19.