Hetherington, C. W. (1922). School program in physical education. World Book Company.
Chicago-referens (17:e uppl.)Hetherington, Clark Wilson. School Program in Physical Education. Yonkers-on-Hudson, New York: World Book Company, 1922.
MLA-referens (9:e uppl.)Hetherington, Clark Wilson. School Program in Physical Education. World Book Company, 1922.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.