1. Okonogi K (1987) An introduction to infant psychiatry (in Japanese). Hattatsu 32:1–42
2. Rutter M (1980) Scientific foundations of developmental psychiatry. Heinemann, London
3. Wolff PH (1966) The causes, controls and organization of behavior in the neonate. Psychological Issues Monograph Series 5. International Universities Press, New York
4. Prechtl HFR (1974) The behavioral states of the newborn infant [review]. Brain Res 76:185–212
5. Klaus M, Kennell J (1976) Maternal-infant bonding. Mosby, St. Louis