Martin Votruba. «Pola Negri». Slovak Studies Program. University of Pittsburgh, 12-04-2013. [Consulta: 22 gener 2015]. «The exact spelling of her and her parents' names is complicated by the mandated use of Russian in government records in that part of [partitioned] Poland, when she was born. For instance, her father's last name is recorded as Халупец at the Lipno Office of Vital Records, which can be rendered in Polish as Chalupec, Chałupec, Chalupiec, or Chałupiec.»
"Polish Film Festivals"Arxivat 7 February 2011 a Wayback Machine., Polish Music News, April 2006, vol 12, #4; ISSN 1098-9188. Los Angeles: Polish Music Center, University of Southern California.
"Polish Film Festivals"Arxivat 7 February 2011 a Wayback Machine., Polish Music News, April 2006, vol 12, #4; ISSN 1098-9188. Los Angeles: Polish Music Center, University of Southern California.