Supplemental Material for
A Meta-Analysis of Writing Treatments for Students in Grades 6–12
Steve Graham, Young-Suk Kim, Yucheng Cao, Joong won Lee, Tamara Tate, Penelope Collins, Minkyung Cho, Youngsun Moon, Huy Quoc Chung, and Carol Booth Olson
Journal of Educational Psychology,
Vol.
115,
No.
7,
pp.
1004–1027
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