Kruszewski, Tomasz. “The Office of the Head of a Village Executed by the Gryf Family in Lesser Poland in the 15th Century”. The Opole Studies in Administration and Law 16, no. 4 (1) (September 17, 2019): 63–75. Accessed November 22, 2024. https://czasopisma.uni.opole.pl/index.php/osap/article/view/1205.