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비고츠키, L. S., 183.2-비'15마 | 학이시습 | 2009 183.2-비'15마,
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Scribner, Bob, 342-S434r | Cambridge University Press | 1994 342-S434r,
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Paul, Peter, 650.8-P324r-R | thames and hudson | 1992 650.8-P324r-R,