J.A.W. Nicolay (2014): The splendour of power. Early medieval kingship and the use of gold and silver in the southern North Sea area (5th to 7th century). Groningen Archaeological Studies, Volume 28, pp. 129-130. Barkhuis Publishing & University of Groningen Library, Eelde/Groningen (online tekst op academia.edu). Gearchiveerd op 4 augustus 2023.
J.A.W. Nicolay (2014): The splendour of power. Early medieval kingship and the use of gold and silver in the southern North Sea area (5th to 7th century). Groningen Archaeological Studies, Volume 28, pp. 129-130. Barkhuis Publishing & University of Groningen Library, Eelde/Groningen (online tekst op academia.edu). Gearchiveerd op 4 augustus 2023.