[57] Untersuchungen über die Libido Sexualis (Researches into the Nature of the Sexual Impulse), Berlin, 1897, chap, iii.
[58] Paris, 1883, vol. i, p. 91.
[59] S. Hall, "The Early Sense of Self," Am. Journ. of Psych., April 1898.
[60] Sexualbiologie, Berlin, 1907, p. 48 et seq.
[61] Union médicale, May 1877.
[62] Psychopathologie légale, Paris, 1903, vol. ii. p. 169.
[63] Havelock Ellis, Studies in the Psychology of Sex, vol. v., "Erotic Symbolism, &c.," p. 53 et. seq.
[64] "The Early Sense of Self," American Journal of Psychology, April 1898, p. 361.
[65] Moll, Die konträre Sexualempfindung, Case 20, 3rd ed., Berlin, 1898.
[66] Neugebauer, Hermaphroditismus beim Menschen (Hermaphroditism in the Human Species), Leipzig, 1908.