AO
Londres: Lawrence & Wishart, 1954.
Londres: John Long, 1931.
Berkeley: University of California Press, 1930.
Londres: Batsford, 1973.
Londres: Longman, 1980.
Nueva York: Farrar & Rinehart, 1936.
Londres: André Deutsch, 1971.
Londres: Lawrence and Wishart, 1980.
Stanford: Stanford University Press, 1966.
Londres: Lawrence & Wishart, 1941.