Geake, Helen & Kenny, Jonathan, red. (2000): . Oxford: Oxbow. ISBN 1-900188-90-2 Higham, N.J. (1993): . Stroud: Sutton. ISBN 0-86299-730-5 Mackenzie, E.; Ross, M. (1834): , Newcastle upon Tyne: Mackenzie and Dent, s. xi.