Charles Sandoe Gilbert: An Historical Survey of the County of Cornwall: To which is Added, A Complete Heraldry of the Same; with Numerous Engravings. Band 2, Teil 1, 1820, S. 443, Digitalisat
William Berry: Encyclopædia Heraldica: Or, Complete Dictionary of Heraldry. 1828, Eintrag Earl of Craven, Digitalisat
