Text ( visual ) : unmediated Educational research : competencies for analysis and applications / L.R. Gay, Geoffrey E. Mills, Peter Airasian. -- 10th ed. -- Boston : Pearson , c2012. -- xvii, 648 p. : ill. (some col.) ; 27 cm. -- Includes bibliographical references and indexes. -- ISBN 9780132613170 ; (BB12805905) ; https://ci.nii.ac.jp/ncid/BB12805905 Author Heading(s): Gay, L. R. ; Mills, Geoffrey E. ; Airasian, Peter W.. -- Classification(s): LCC : LB1028 ; DC22 : 370.72. -- Subject Heading(s): LCSH : Education -- Research