found: LC data base, 08-07-90(hdg.: Negri, Pola, 1897- )
found: San Antonio Express-News, 08-02-87(Pola Negri, b. 12/31/1894 or 1897 (Miss Negri always insisted 1899), Lipno, Polish Russia; d. Aug. 1, 1987, San Antonio, Tex.; original name: Apollonia Barbara Chapulek)
found: Czapińska, W. Polita, 1989:p. 14 (Apolonia Chałupiec; Chałupec, Apolonia)
found: IMDB, Mar. 27, 2006(Pola Negri; b. Dec. 31, 1894, Janowa, Poland; d. Aug. 1, 1987, San Antonio, Tex.; birth name: Barbara Apolonia Chalupiec)
found: SSDI, Mar. 27, 2006(Negri, Pola; b. Dec. 31, 1899; d. Aug. 1987, San Antonio, Tex.)
found: Wielcy Polacy XX wieku, 2016:p. 46 (Pola Negri; 1896-1987)