Lowe 1912, pp. 190–192. Lowe, Walter Bezant (1912). The Heart of Northern Wales: As it was and as it Is, Being an Account of the Pre-historical and Historical Remains of Aberconway and the Neighbourhood. Vol. 1. p. 187-328.The heart of North Wales at Google Books
Brown 1962, pp. 123–125; Taylor 2008, p. 8 Brown, R. Allen (1962). English Castles. London, UK: Batsford. OCLC1392314. Taylor, Arnold (2008). Caernarfon Castle and Town Walls. Cardiff, UK: Cadw. ISBN978-1-85760-209-8.