By Ingrams, Richard, Piper, John, J.
By Dodgshon, Robert A., Butlin, Robin A.
By Herber, Mark D.
By Taylor, Arnold J., Avent, Richard, Cadw: Welsh Historic Monuments
By Davies, P.L., Freedland, Mark R.
By Manchester, A. H.
By Aris, Mary, Capell
By Sloan, Roy
By William Howarth, C.P. Rodgers
By Matar, Nabil
By Jenkins, Geraint H.
By Wales Tourist Board, Robinson, David
By Vaughan-Thomas, Wynford, Brabbs, Berry
By Reid, Alan
By Jenkins, Philip
By Gruffudd, Heini
By Kearney, Hugh
By Edwards, Gareth
By Whiteman, Robin, Talbot, Rob
By Roberts, Graham
By Glanmor Williams
By Gwyndaf, Robin, Finlay, Jeremy
By Dorothy P.H. Wrenn
By Ellis, Osian
By Great Britain: Welsh Office
By Taylor, Arnold J.
By Brough, Gideon
By Sharkey, John