Manners, Victoria; Williamson, George Charles; Kauffmann, Angelica [Ill.]: Angelica Kauffmann: her life and her works (London: John Lane the Bodley Head Limited, 1924)

EDWARD, 12TH EARL OF DERBY, WITH LADY ELIZABETH HAMILTON
HIS FIRST WIFE AND THEIR INFANT SON, AFTERWARDS 13TH, EARL.
Bequeathed to Lord Derby by Lady Charlotte Hornby.
From the original painting at Knowsley.