National Trust (Great Britain), Lees-Milne, J., Brown, I., Trevelyan, G. M., & Matheson, D. M. (1945). The National Trust: A record of fifty years' achievement. B.T. Batsford.
Dyfyniad Arddull ChicagoNational Trust (Great Britain), James Lees-Milne, Ivor Brown, George Macaulay Trevelyan, and D. M. Matheson. The National Trust: A Record of Fifty Years' Achievement. London: B.T. Batsford, 1945.
Dyfyniad MLANational Trust (Great Britain), et al. The National Trust: A Record of Fifty Years' Achievement. B.T. Batsford, 1945.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.