ISBN 0-19-811588-1* Brynley F. Roberts, "Geoffrey of Monmouth and Welsh Historical Tradition," Nottingham Medieval Studies, 20 (1976), 29-40.
ISBN 0-19-811588-1* "Brynley F. Roberts", Geoffrey of Monmouth and Welsh Historical Tradition, Nottingham Medieval Studies, 20 (1976), 29—40.