1. Courville CB: Pathology of the Central Nervous System. 3rd edition. Mountain View, CA: Pacific Press Publication Association, 1960.
2. Austin EJ: Head trauma in the aged. In Duckett S (ed): Pathology of the Aging Human Nervous System. Philadelphia: Lea & Febiger, 1990.
3. Mandel S: Minor head injury may not be minor. Postgrad Med J, 1989; 85(6):213–220.
4. Plaut MR, Gifford RR: Trivial head trauma and its consequences in a perspective of regional health care. Milit Med, 1976; 141(4):244–247.
5. McMahon RT, Flowers SM: The high cost of a bump on the head. Business Health, 1986; 3:47–48.