References
- Babcock , H. 1933 . Dementia Praecox: A Psychological Study , Lancaster, Pa. : Science Press .
- Kendig , I. and Richmond , W. 1940 . Psychological Studies in Dementia Praecox , Ann Arbor, Mich. : Edward .
- Wechsler , D. 1939 . The Measurement of Adult Intelligence , Baltimore : Williams & Wilkins .