See his Journal of My Other Self (tr. 1930) and Letter to a Young Poet (rev. ed. 1954); biographies by H. F. Peters (1960), E. M. Butler (1941, repr. 1973), D. Prater (1986), and R. Freedman (1996); studies by E. C. Mason (1961), K. A. Batterby (1966), J. Rolleston, and A. Stephens (tr. 1972), E. Schwartz (1981), and W. H. Gass (2000).