Gwynedd Archaeological Trust ArchwilioArchived 31 October 2013 at the Wayback Machine Bryn y Gefeiliau (Caer Llugwy) Roman Fort, Primary Reference Number (PRN): 799. Accessed 12 September 2013
J.P. Hall (November–December 1923). "Caer Llygwy: the Roman Fort between Capel Curig and Betws-y-Coed". The Classical Review. 37 (7/8): 186. doi:10.1017/s0009840x00085413. S2CID211624889.
J.P. Hall (November–December 1923). "Caer Llygwy: the Roman Fort between Capel Curig and Betws-y-Coed". The Classical Review. 37 (7/8): 186. doi:10.1017/s0009840x00085413. S2CID211624889.
Gwynedd Archaeological Trust ArchwilioArchived 31 October 2013 at the Wayback Machine Bryn y Gefeiliau (Caer Llugwy) Roman Fort, Primary Reference Number (PRN): 799. Accessed 12 September 2013