Artikel Jurnal
Maryland Rowman & Littlefield,, 2014
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Nentl, Nancy J., author
McGraw-Hill/Irwin, 2003
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Sandra L. Christenson, Amy L. Reschly, Cathy Wylie, editors
[Springer, ], 2012
eBooks
Bell, Suzanne S., author
Libraries Unlimited, 2015
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