Buildings of Wales: Powys; Montgomeryshire, Radnorshire and Breconshire, Yale University Press. Thomas C. G. (ed), (1997) The charters of the Abbey of Ystrad Marchell. Aberystwyth : The National Library of Wales. Williams, D. H. (1992). An Appreciation of Stephen William Williams, Montgomeryshire Collections, Vol 80, 55–94 Williams, D. H.(1995).The Exploration and Excavation of Cistercian Sites in Wales, Archaeologia Cambrensis, Vol 144, 1–25 Williams, D. H. (2001). The Welsh Cistercians: written to commemorate the centenary of the death of Stephen William Williams (1837–1899), (The father of Cistercian archaeology in Wales). Gracewing Publishing. . . Williams S. (1891), (with Jones M C), Excavations on the site of Strata Marcella Abbey,Montgomeryshire Collections, Vol 25. References External links Survey of site by CPAT 2012 CPAT Spring 2012 Newsletter Survey of site by CPAT 2012 CPAT Autumn 2012 Newsletter The Cistercians in Yorkshire 'House of Cistercian monks: Abbey of Buildwas', A History of the County of Shropshire: Volume 2 (1973), pp. 50-9. Cistercian monasteries in Wales History of Powys Buildings and structures in Powys 1170 establishments in Europe Christian monasteries established in the 12th century 1536 disestablishments in Wales 12th-century establishments in Wales