By Gelfer Jeffery I.   Xu Yaoying   Perkins Peggy G.   in Early Childhood Education Journal

ISSN:1082-3301|32|2|127-132

Springer Publishing Company ‎(2004)‎

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By Xu Yaoying   Gelfer Jeffrey   Sileo Nancy   Filler John   Perkins Peggy   in Early Child Development and Care

ISSN:0300-4430|178|6|617-635

Routledge Ltd‎(2008)‎

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