@book{153445,
	author = {Thomas, Jerry R. Ed., and Nelson, Jack K. Ed. and Silverman, Stephen J. Ed.},
	title = {Research methods in physical activity},
	publisher = {Human Kinetics},
	year = {2011},
	address = {United States of America},
	edition = {6th ed.},
	note = {includes bibliographical references and index}
}