C. G. Jung 
C.G. Jung Letters, Volume 1 [PDF ebook] 

Beginning with Jung’s earliest correspondence to associates of the psychoanalytic period and ending shortly before his death, the 935 letters selected for these two volumes offer a running commentary on his creativity. The recipients of the letters include Mircea Eliade, Sigmund Freud, Esther Harding, James Joyce, Karl Kernyi, Erich Neumann, Maud Oakes, Herbert Read, Upton Sinclair, and Father Victor White.