Schapiro (1980:264, note 66). MacLeod, Mindy; Mees, Bernard (2006). Runic Amulets and Magic Objects. Boydell Press. 145–148쪽. ISBN 1-84383-205-4. MacLeod
Press. ISBN 0-19-283946-2. MacLeod, Mindy; Mees, Bernard (2006). Runic Amulets and Magic Objects. Boydell Press. ISBN 1-84383-205-4. Morris, Christopher