1. 1. Cromer OC Cromer GC. Modern automotive systems. In: Goetz PW ed. Encyclopedia Britannica. Chicago 111: Encyclopedia Britannica Publishing Company; 1985; 28:780.
2. 2. Purdy KW. History of the automobile. In: Goeiz PW ed. Encyclopedia Britannica. Chicago III: Encyclopedia Britannica Publishing Company. 1985; 28:773.
3. 3. National Safely Council. Accident Facts. Chicago 111: National Safety Council: 1980:53.
4. 4. Aitken AP Magill HK- Fractures involving the distal femoral epiphyseal cartilage. J Bone Joint Surg. 1952; 34A:96-108.
5. 5. Edwards HC. The mechanism and treatment of backfire fracture. J Bone Joint Surg. 1926; 8:701-717.