Walter Bagehot, Norman St. John-Stevas (1959). “Walter Bagehot: A Study of His Life and Thought, Together with a Selection from His Political Writings”, London : Eyre & Spottiswoode
"The Impact of Labour, 1920-1924: The Beginnings of Modern British Politics" by Maurice Cowling, Cambridge: Cambridge University Press, (p. 147), 1971.