The Apple-tree girl [MP] 1917 credits (Shirley Mason, cast)
Halliwell's Filmgoer's comp., 1980 (Shirley Mason; b. 1900; silent screen actress; real name, Leona Flugrath)
Int'l film necrology, 1981 (Shirley Mason; d. 7/27/1979)
IMDb, August 3, 2017 (Shirley Mason; born June 6, 1900 in Brooklyn, New York; birth name Leonie Flugrath; died July 27, 1979 in Los Angeles, California; actress)