Adam Mickiewicz. "Pani Twardowska". mickiewicz.kulturalna.com (in Polish). Retrieved 2009-03-20.
web.archive.org
Roman Bugaj. "Mistrz Twardowski". www.wilanow-palac.art.pl (in Polish). "Mówią wieki", nr 9, 1972. Archived from the original on 27 October 2007. Retrieved 2009-03-20.
Jan Mielniczka (2007-10-29). "Legendy o Węgrowie". www.wegrow.com.pl (in Polish). Archived from the original on 2008-10-06. Retrieved 2009-03-19.
wegrow.com.pl
Jan Mielniczka (2007-10-29). "Legendy o Węgrowie". www.wegrow.com.pl (in Polish). Archived from the original on 2008-10-06. Retrieved 2009-03-19.
wilanow-palac.art.pl
Roman Bugaj. "Mistrz Twardowski". www.wilanow-palac.art.pl (in Polish). "Mówią wieki", nr 9, 1972. Archived from the original on 27 October 2007. Retrieved 2009-03-20.