More's MS letterbook, f. 81, to Lord Grey de Wilton, 20 June 1787.
P.R. Andrew, 'The Watercolours of Jacob More', Old Watercolour Society Annual Volume, 61, 1986, p. 34 (illus).
P.R. Andrew, 'Jacob More: Biography and a Checklist of Works', Walpole Society, LV, 1990, p. 172, no. B. 7. viii, as 'Monument of the Battle between the Horatii and the Curatii'.
London, Fine Art Society, Watercolours 1780-1950, 1978, no. 52.