Drei Abhandlungen zur Sexualtheorie.

The work which Freud considered second in importance only to his Die Traumdeutung. Freud’s epochal theory of infantile sexuality linked the forces motivating the development of body and mind from earliest infancy. Infantile sexuality was a fact known, Freud said, to every nursemaid, yet the above work provoked and continues to provoke controversy in both scientific and popular sectors. English translation, 1910.