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Briggs 1991, p. 154; "Hay Castle", Rick Mather Architects, retrieved 2 May 2016; "Castle House Hay", Coflein, retrieved 2 May 2016 Briggs, C. S. (1991), "Garden Archaeology in Wales", in Brown, A. E. (ed.), Garden Archaeology: Papers Presented to a Conference at Knuston Hall, Northamptonshire, April 1988, London, UK: Council for British Archaeology, pp. 138–159, ISBN1-872414-17-6
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cpat.org.uk
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"Hay Castle", Rick Mather Architects, retrieved 2 May 2016
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