Foster, Joseph, ed. (1887). Pedigrees recorded at the Visitations of the County Palatine of Durham made by William Flower, Norroy King-of-Arms, in 1575, by Richard St George, Norroy King-of-Arms, in 1615, and by William Dugdale, Norroy King-of-Arms, in 1666. London, p.12, "Bellasis of Morton"[1]
Mackenzie, Eneas, An historical, topographical, and descriptive view of the county palatine of Durham, 1834, p.355 [3]
