Frohman and Marcosson, p. 386; Preston, p. 204; «Frohman, Charles». The Lusitania Resource; Zecher, p. 462.
Ellis, Frederick D (1915). The Tragedy of the Lusitania. National Publishing Company. pp. 38-39; Preston, p. 204; «Frohman Calm; Not Concerned About Death, Welcomed It as Beautiful Adventure, He Told Friends at End» (11 de mayo de 1915). New York Tribune. p. 3; Frohman y Marcosson, p. 387; «Frohman, Charles». The Lusitania Resource.
Frohman y Marcosson, p. 387; superviviente que identificó el cadáver de Frohman citado en Hoehling, Adolph A. (1991). The Last Voyage of the Lusitania. Random House Value Publishing. pp. 217-218; Ramsey, David (2001). Lusitania, Saga and Myth. W. W. Norton & Company. pp. 96-97; New York American (9 de mayo de 1915), p. 1; «Finds Frohman’s Body» (9 de mayo de 1915). New York Press. p. 5; «Frohman, Charles». The Lusitania Resource; Zecher, p. 443.