1. 1. Hoder EL Cohen DJ. Repetitive behavioi patterns of chiidhood. lit Levine MU Carey WB Cracker AC Gross RT eds. Devdopmeraai-Behaaaral Pediatrics. Philadelphia Pa: WB Saunders Co; 1983:607-622.
2. 2. Bchrman R Vaughan V Nelson WE eds. Nelson's Textbook tf Pediatrics. Philadelphia Pa: WB Saunders Co; 1987.
3. 3. Infante PE An epidemiologie study of finger habits in preschool children as related co malocclusion socioeconomic status race sex sine of community. J Dem Child. 1976;43:33-38.
4. 4. Klackenberg G. Thurnbsucking. frequency and etiology Pediatra. 1949;4:41 8-424.
5. 5. Olness KN Gardner GG. Hypnosis and Hypnotherapy Wish Children. 2nd ed. Philadelphia Pa: Crune and Stratton; 1988.