Cohen, Louis Research methods in education / Louis Cohen, Lawrence Manion and Keith Morrison. - 7th ed. - New York : Routledge, c2011. - xxii, 758 p. : ill. ; 25 cm. Includes bibliographical references and index ISBN: 9780415583367 9781315456539 Subjects--Topical Terms: Education--Research--Great Britain. LC Class. No.: LB1028 / .C64 2011