Kosto 2003, p. 144: Cui valde credidisse Karolus imperator Magnus ex eo probatur, quod illustres Saxonum obsides XV, quos adduxit de Saxonia, ipsius fidei custodiendos conmisit. Kosto, Adam J. (2003). "Hostages in the Carolingian world (714–840)". Early Medieval Europe. 11 (2): 123–47. doi:10.1111/1468-0254.00105. S2CID154868894.
Kosto 2003, p. 144: Cui valde credidisse Karolus imperator Magnus ex eo probatur, quod illustres Saxonum obsides XV, quos adduxit de Saxonia, ipsius fidei custodiendos conmisit. Kosto, Adam J. (2003). "Hostages in the Carolingian world (714–840)". Early Medieval Europe. 11 (2): 123–47. doi:10.1111/1468-0254.00105. S2CID154868894.