William Mitchell, Cairnton House, Banchory.
Anon sale, Sotheby's, London, 13 November 1996, lot 51 (sold £56,500).
Listed in the artist's account books under 'Sitters of Derby'; 'Mr. Copestake and Miss Copestake £6.6s'
W. Bemrose, The Life and Work of Joseph Wright of Derby ARA, London, 1885, p. 119.
B. Nicholson, Joseph Wright of Derby, Painter of Light, London, 1968, p. 190.