Travers, Robert Morris William, 1913- An introduction to educational research / [by] Robert M. W. Travers. - 3rd ed. - New York : Macmillan, [1969]. - xxi, 450 p. ; 24 cm. - 370/.78 . Bibliogr.: p. 427-436. Subjects--Topical Terms: Education--Research. Dewey Class. No.: 370/.78