Mertler, Craig A. Introduction to educational research [Book] / Craig A. Mertler, C.M. Charles. - 7th ed. - India : Pearson Education in South Aisa, 2012. - xxvi, 405 p. : ill. ; 28 cm. ISBN: 9788131764381 Subjects--Topical Terms: Education--Research--Methodology. Dewey Class. No.: 370.72