@book{207423,
	author = {Powers, Scott K. and Howley, Edward T.},
	title = {Exercise physiology},
	publisher = {McGraw-Hill},
	year = {c2007.},
	address = {Boston},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0703/2006283912-d.html}
}