Zofia Uszyńska, University of Michigan, Poland, Travel Guide Publisher: AGPOL, 1960. Digitized Nov 13, 2006. Accessed 2008-01-04. "Oleśnica used to be the capital of the Duchy of Oleśnica, which was ruled until the end of the 15th c. by Polish dukes of the Piast dynasty."
panorama-miast.com.pl
(en polaco) (en inglés) Panorama miast, OleśnicaArchivado el 13 de octubre de 2007 en Wayback Machine. Accessed 2008-01-04. "Oleśnica had been an important trade settlement and the capital of a Duchy, undergoing its prime development during the Renaissance period."
web.archive.org
(en polaco) (en inglés) Panorama miast, OleśnicaArchivado el 13 de octubre de 2007 en Wayback Machine. Accessed 2008-01-04. "Oleśnica had been an important trade settlement and the capital of a Duchy, undergoing its prime development during the Renaissance period."
