"The Impact of Labour, 1920-1924: The Beginnings of Modern British Politics" by Maurice Cowling, Cambridge: Cambridge University Press, (p. 147), 1971.
Benjamin Disraeli, Edmund Gosse, Robert Arnot (1904). “The works of Benjamin Disraeli, earl of Beaconsfield: embracing novels, romances, plays, poems, biography, short stories and great speeches”