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1
Youngentob, K., | Sage Publications | 2005 ,
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Larson, Roland E., 414.1-L334c-안진홍 | D.C. Heath | 1990 414.1-L334c-안진홍,
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ELarson, Roland, 414.1-E37b | D.C. Health and company | 1995 414.1-E37b,
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Larson, Roland E, 412-L334a | Heath and Company | 1985 412-L334a,