Schmitt, Jürgen K. „John B. Freed, Noble Bondsmen. Ministerial Marriages in the Archdiocese of Salzburg, 1100-1343“. Südost-Forschungen 1, no. 1 (November 30, 2021): 600–602. Zugegriffen Mai 1, 2025. https://www.suedost-forschungen.de/portal/index.php/sof/article/view/7687.