Gall, Joyce P. Applying educational research : a practical guide / Joyce P. Gal, M. D. Gall, Walter R. Bag - 5a ed. - Boston : pearson and AZ , 2005, c1999 - XIX, 570 p. ; 24 cm. Incluye índice ISBN: 0205380786 Subjects--Topical Terms: Educación --- Investigación LC Class. No.: LB 1028 / G35 2005