Williams 1895，第116頁. Williams, W.R., Parliamentary History of the Principality of Wales,from the earliesr times to the present day, 1541-1895 ..., Brecknock: Priv. Print. for the author by E. Davis and Bell: 116, 1895
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Carlton 1992，第258頁. Carlton, Charles, Going to the Wars: The Experience of the British Civil Wars, 1638-1651 illustrated, reprint, Routledge: 258, 1992, ISBN 9780415103916
Bingley 1839，第226頁. Bingley, William, Excursions in North Wales: including Aberystwith and the Devil's Bridge, intended as a guide to tourists 3, Longman, Orme: 226, 1839
Pettifer 2000，第66頁. Pettifer, Adrian, Welsh Castles: A Guide by Countries illustrated, Boydell & Brewer: 66, 2000, ISBN 9780851157788
