Marcosson & Frohman, str. 387; Survivor discovering Frohman's body quoted in Hoehling, Adolph A., The Last Voyage of the Lusitania (Random House Value Publishing, 1991), str. 217–18; Ramsey, David, Lusitania, Saga and Myth (W. W. Norton & Company, 2001), str. 96–97; New York American, 1915-05-09, p. 1; New York Press, "Finds Frohman's Body", 1915-05-09, str. 5; "Charles Frohman". The Lusitania Resource; Zecher, str. 443.
