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by American Psychological Association
by Lancaster, E. L.
by Wong, Harry K.
by Adams, Laurie
by Peggy M. Houghton
by Bredekamp, Sue; Copple, Carol; National Association for the Education of Young Children
by National Council for the Social Studies
by Liu, Yuehua; Yao, Tao-Chung; Bi, Nyan-Ping; et al.
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