1. Kraepelin E (1907). Lehrbuich der Psychiatrie Translated by Diefendorf AR. (New York, The MacMillan Company).
2. Gottesman II and Shields J (1982). Schizophrenia: The Epigenetic Puzzle. (Cambridge, Cambridge University Press).
3. Crow TJ (1986). The continuum of psychosis and its implication for the structure of the gene. British J. of Psychiatry, 149, 419.
4. Tsuang MT, Winokur G, Crowe RR (1980). Morbidity risks of schizophrenia and affective disorders among first-degree relatives of patients with schizophrenia, mania, depression, and surgical conditions. British J. of Psychiatry, 137, 497.
5. Gershon ES, DeLisi LE, Maxwell ME, et al.(in press). A family study of schizophrenia and schizo-affective disorder. Archives of General Psychiatry.