1. Stuart Ball, Baldwin and the Conservative Party: The Crisis of 1929–1931 (New Haven, CT, 1988);
2. John Campbell, Lloyd George. The Goat in the Wilderness (London, 1977), Chapters 9–10;
3. M. Phillips Price, My Three Revolutions (London, 1969), pp. 263, 265.
4. Paul Corthorn, ‘W.E.D. Allen, Unionist Politics and the New Party’ Contemporary British History 23:4 (December 2009) 509–26.
5. Sir George Catlin, For God’s Sake Go: An Autobiography (Gerrards Cross, 1972), pp. 73–86,