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by American Psychological Association
by Bredekamp, Sue; Copple, Carol; National Association for the Education of Young Children
by Lancaster, E. L.
by Wong, Harry K.
by Liu, Yuehua; Yao, Tao-Chung; Bi, Nyan-Ping; et al.
by National Council for the Social Studies
by Cooper, John O.; Heron, Timothy E.; Heward, William L.
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