Bingley, William (1839), Excursions in North Wales: including Aberystwith and the Devil's Bridge, intended as a guide to tourists (3 udgave), Longman, Orme, s. 226
Pettifer, Adrian (2000), Welsh Castles: A Guide by Counties (illustrated udgave), Boydell & Brewer, s. 66, ISBN9780851157788