AO
Nueva York: Taplinger, 1972.
Nueva York: International Publishers, 1934.
Londres: Victor Gollancz, 1933.
Northampton, Mass.: Dept. of History of Smith College, 1932.
Londres: Hodder and Stoughton, 1932.
Londres: Lawrence & Wishart, 1954.
Londres: Allen & Unwin, 1935-1961.
Londres: John Long, 1931.
Nueva York: Vanguard Press, 1930.
Nueva York: Macmillan, 1930.