1. Present condition of gymnastics and athletics in American colleges;Babbitt;American Physical Education Review,1903
2. Physical education in California—1854–1900;DeGroot;Journal of Health and Physical Education,1939
3. Normal physical training;Gulick;Physical Education,1892
4. A Guide to the History of Physical Education;Leonard,1927
5. Adoption of the sports program, 1906–39: The role of accommodation in the transformation of physical education;Lewis;Quest,1969