The Committe on the Student in Higher Education, 1968
Buku Teks
edited by John N. Gardner and A. Jerome Jewler
Wadsworth, 1985
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Ayu Pratama Siantoro
Fakultas Psikologi Universitas Indonesia, 2012
UI - Skripsi (Open)
Diyah Ayu Asmarani
Universitas Indonesia, 2015
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Ellis, Dave
Wadsworth and Cengage Learning, 2013
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