1. American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders, edn 4. Washington, DC: American Psychiatric Association; 1994.
2. Anders TF: Night-waking in infants during the first year of life. Pediatrics 1979, 63:860–864.
3. Palmer CD, Harrison GA, Hirons RW: Sleep patterns and life styles in Oxfordshire Village. J Biosoc Sci 1980, 12:437.
4. Law AL: California Assessment Program: Student Achievement in California Schools: 1979–1980, annual report. Los Angeles:1980.
5. FerberR: Sleeplessness in the child. In Principles and Practice of Sleep Medicine. Edited by Kryger MH, Roth T, Dement WC. Philadelphia: WB Saunders; 1989:633–639.