1. Freud, S. 1907.The sexual enlightenment of children. Collected Papers2
2. Freud, S. 1908.On the sexual theories of children. C.P.2
3. Freud, S. 1909a.Notes upon a case of obsessional neurosis. C.P.3
4. Freud, S. 1909b.Analysis of a phobia in a five-year-old boy. C.P.3