{{cite web |url=https://marcus.uib.no/instance/webresource/c440ed23-744d-4a0f-83a1-363df47962e5 |title=Diplom datert 1404, 2. mars. Heggen (Modum, Buskerud). Trykt i Diplomatarium Norvegicum B.9. Nr. 199. |author=Avdeling for spesialsamlinger |accessdate=Wed Apr 24, 2024 |publisher=University of Bergen Library}}