Roberts, Peter (1811). The Chronicle of the Kings of Britain; Translated from the Welsh Copy Attributed to Tysilio; Collated with Several Other Copies, and Illustrated with Copious Notes; to Which Are Added, Original Dissertations. London: E. Williams. str. 150–151.
Frost, Christian (2009). Time, Space, and Order: The Making of Medieval Salisbury. Bern: Peter Lang. str. 34.
Newman, John Henry; in sod. (1844). »Chapter X: Britain in 429, A.D.«. Lives of the English Saints: St. German, Bishop of Auxerre. London: James Toovey. str. 92. Arhivirano iz prvotnega spletišča dne 21. marca 2016. Pridobljeno 16. decembra 2014.
Newman, John Henry; in sod. (1844). »Chapter X: Britain in 429, A.D.«. Lives of the English Saints: St. German, Bishop of Auxerre. London: James Toovey. str. 92. Arhivirano iz prvotnega spletišča dne 21. marca 2016. Pridobljeno 16. decembra 2014.