Thomas, Jerry R. Research methods in physical activity / Jerry R. Thomas, Jack K. Nelson, Stephen J. Silverman. - 7th ed. - Champaign, IL. : Human Kinetics, 2015. - xv, 481 p. : ill. ; 29 cm. Includes bibliographical references and indexes. ISBN: 9781450470445 Subjects--Topical Terms: Physical education and training--Research. LC Class. No.: GV361 / .T46 2015