Text ( visual ) : unmediated Educational research : planning, conducting, and evaluating quantitative and qualitative research / John W. Creswell, Timothy C. Guetterman. -- 6th ed. -- Upper Saddle River, N.J. : Pearson , c2019. -- xxii, 655 p. : ill. ; 26 cm. -- Includes bibliographical references (p. 631-639) and indexes. -- ISBN 9780134519364 ; (BB26859968) ; https://ci.nii.ac.jp/ncid/BB26859968 Author Heading(s): Creswell, John W. ; Guetterman, Timothy C.. -- Classification(s): LCC : LB1028 ; DC23 : 370.72. -- Subject Heading(s): LCSH : Education -- Research -- Methodology

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