Henry Brougham to Thomas Creevey, 1830 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)
Sydney Smith to Roderick Impey Murchison, [September] 1840 in A Memoir of the Reverend Sydney Smith. By his Daughter, Lady Holland. With a
Selection from his Letters, edited by Mrs. Austin 2 vols (London: Longman, Brown, Green, and Longmans, 1855)