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2 Fortosis, Steve, "Theological foundations for a stage model of spiritual formation" (96) : 49-63, 2001
3 Adams, Daniel J, "The roots of Korean theology" (7) : 187-207, 1985
4 Chung, Chun Ki, "The reason for the decrease of Christianity"
5 Kohlberg, Lawrence, "The philosophy of moral development: Moral stages and the idea of justice" Harper & Row 1981
6 Benson, Peter L, "The faith maturity scale: conceptualization, measurement, and empirical validation" (5) : 1-26, 1993
7 Kweon, Bakhyowon, "The failure of Korean church"
8 Zinnbauer, Brian J, "The emerging meanings of religiousness and spirituality: Problems and prospects" (67) : 889-, 1999
9 Fowler, James, "Stages of faith: The psychology of human development and the quest for meaning" Harper & Row Publishers 1981
10 Kohlberg, Lawrence, "Stages of development as a basis for education. in: Moral development, moral education, and Kohlberg" Religious Education Press 15-98, 1980
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34 Wasson, Alfred W, "Church growth in Korea" International Missionary Council 1934
35 Paik,Jong Koe, "Christian faith in Korea: The earliest Protestant mission and Ch’oe Pyong-hon" Boekencentrum 1998
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37 Thompson, Edward H, "Beneath the status characteristic: Gender vriations in religiousness" (30) : 381-394, 1991