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(2) Shingo Okuda, 2008, The Sociological Implications of T. Shibutani's Reference Group Theory: An Interactionist Analysis of "Modern Mass Society" (Master's thesis, The Graduate School of Humanities and Social Sciences, Kagoshima University).
(3) Qinglin Yuan, 2016, The Use of Pocketbook as Secondary Socialization: A Sociological Study of Chinese Adaptation to Japanese Society (Master's thesis, The Graduate School of Humanities and Social Sciences, Kagoshima University).