TY - BOOK AU - Gay, L. R. AU - Mills, Geoffrey E. AU - Airasian, Peter W. TI - Educational research : competencies for analysis and applications ET - 9th ed PB - Merrill, Pearson Education International PY - 2009 T2 - Pearson international edition EP - xvi, 618 p. UR - https://ci.nii.ac.jp/ncid/BA91350508 SN - 9780136040941 ER -