@book{50339,
	author = {Duncan, Ray O. and Watson, Helen Belle,},
	title = {Introduction to physical education},
	publisher = {Ronald Press Co.,},
	year = {1960},
	address = {New York :},
	note = {Include index},
	url = {http://catalog.hathitrust.org/api/volumes/oclc/620689.html}
}