Gordon, Robert (1813) [Printed from original manuscript 1580 – 1656]. A Genealogical History of the Earldom of Sutherland. Edinburgh: Printed by George Ramsay and Co. for Archibald Constable and Company Edinburgh; and White, Cochrance and Co. London. p. 73-74. Retrieved 30 January 2021. "About this tyme" (p. 74) and "The yeir of God 1455" (p. 73)
