William Ewart Gladstone recounting the conversation to Lord Rendel in 1889, from F. E. Hamer editor. The Personal Papers of Lord Rendel - London: Ernest Benn Ltd, 1931.
Palmerston's memorandum - 15 May 1864.
Letter to William Ewart Gladstone - 12 May, 1864. Philip Guedalla editor. Gladstone and Palmerston, being the Correspondence of Lord Palmerston with Mr. Gladstone 1851-1865 - London: Victor Gollancz, 1928.
During the general election of summer 1865 where the Chartist Rowcliffe voted for a Conservative and another Liberal in order to oust Palmerston from the two-member constituency. Quoted in F. J. Snell, Palmerston's Borough - Tiverton, 1894.
Speech to the Agricultural Association at Romsey, quoted in "Lord Palmerston At Romsey," - The Times - 16 December 1864.
Letter to Lord John Russell - 13 September 1865, in E. Ashleyeditor - The Life of Henry John Temple, Viscount Palmerston 1846-1865 - London, 1876.