Tavistock Publications, 1970
Buku Teks
Stanford University, 1973
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Gudjonsson, Gisli H.
Wiley, 2003
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Gilchrist, Paul R., author
Westminster Theological Seminary Philadelphia, Pennsylvania, USA ; International Reformed Evangelical Seminary Jakarta, Indonesia, 2016
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Ringel, william E.
Clark Boardman Company Ltd., 1972
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