Darling, EA: The effects of training. Boston Med Surg J141. 205-233, 1899
2.
Genesis 32: 24, 25, 32 In Holy Bible, King James Version. Abradale Press, 1959
3.
Finley MI, Pleket HW The Olympic Games, The First Thousand Years New York, Viking Press, 1976
4.
Nichols, EH The physical aspect of American football Boston Med Surg J154:1-8,1906
5.
Nichols, EH Football injuries of the Harvard squad for three years under the revised rules . Boston Med Surg J16033-37, 1909
6.
Ryan, AJ: History of the Development of Sport Sciences and Medicine. Encyclopedia of Sport Sciences and Medicine New York, Macmillan Company, 1971, pp xxxiii-xivii
7.
Snook, GA The father of sports medicine Am J Sports Med6. 128-131, 1978
8.
Stevens, MA, Phelps, WM The Control of Football Injuries New York, AS Barnes & Co , 1933