Bleuler E. (1924). Textbook of Psychiatry. Nueva York: Macmillan. p. 214. See: Read J, Masson J (2004). «Genetics, eugenics and mass murder». En Read J, Mosher RL, Bentall RP (eds.), ed. Models of Madness: Psychological, Social and Biological Approaches to Schizophrenia. Hove, East Sussex: Brunner-Routledge. p. 36. ISBN1583919058.