Não informado. (1901). Physical training. Young Men's Christian Association.
Chicago-referens (17:e uppl.)Não informado. Physical Training. New York: Young Men's Christian Association, 1901.
MLA-referens (8:e uppl.)Não informado. Physical Training. Young Men's Christian Association, 1901.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.