Cohen, Louis, 1928- Research methods in education / Louis Cohen, Lawrence Manion, and Keith Morrison. - 5th ed. - London ; New York : RoutledgeFalmer, 2000. - xvi, 446 p : ill ; 25 cm. ISBN: 0415195411 (pbk.) LCCN: 99088211 Subjects--Topical Terms: Education--Research.Education--Research--Great Britain. Dewey Class. No.: 370/.7/2