1. Kraepelin E. Psychiatrie. Leipzig, 4 Aufl. 1893.
2. Ey H. Schizophrenies. Encycl Med Chir. Paris. 1955;37286;A10,2.
3. Bleuler E. Dementia praecox oder Gruppe der Schizophrenien. Handbuch der Psychitrie. Leipzig—Wien. 1911.
4. Strauss J, Carpenter WT, Bartko JJ. Towards an understanding of the symptom picture considered characteristic of schizophrenia: its description, precursors, and outcome. Schizophren Bull. 1974;11:61-69.
5. Buchanan RW., Carpenter WT. Schizophrenia. Introduction and overview. In: Kaplan B., Sadock V. Comprehensive textbook of psychiatry. 7th ed., vol. I, Philadelphia. 2000;1096-1110.