{{cite web |url=https://marcus.uib.no/instance/webresource/05ec2fce-a688-4e26-a1be-5995756dc7f2 |title=Diplom datert 1332, 12. mars. Frogn (Follo, Akershus). Trykt i Diplomatarium Norvegicum B.2. Nr. 193 |author=Avdeling for spesialsamlinger |accessdate=Thu Apr 18, 2024 |publisher=University of Bergen Library}}