1. Hollingshead A. B. (1957) Two-Factor Index of Social Position. Mimeographed. New Haven, Conn.
2. Pollack M. , Woerner M. G. & Klein D. F. (1970). A comparison of childhood characteristics of schizophrenics, personality disorders and their siblings, in Life History Research in Psychopathology (eds. Roff & Ricks ). Minneapolis.
3. Lane E. A. & Albee G. W. (1970) Intellectual antecedents of schizophrenia, in Life History Research in Psychopathology (eds. Roff and Ricks ). Minneapolis.
4. Personality development of twenty-seven children who later became psychotic.
5. Children who later became schizophrenic1