↑ Pollard, A.F. (2020). Tyrwhitt [Tirwhit], Sir Robert (d. 1428). Edward Powell, Ed. Oxford DNB. Oxford Univ. Press. Web. https://doi.org/10.1093/ref:odnb/27957
↑ Burke, John. A genealogical and heraldic history of the commoners of Great Britain and Ireland, enjoying territorial possessions or high official rank; but univested with heritable honours, Vol. I (Henry Colburn, London, 1835) "Tyrwhitt, of Nantyr," p. 584.
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