Sweedlum, Verne S.
Man in society. vol.I & II
American Book Company, 1956
 Buku Teks SO
Xu, Zhonglin
Creation of the gods 1, II, III, IV
World Publishing House, 2000
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Statistical analysis of continuous data (Vol.I-IV)
edited by Roger Penn, Damon Berridge
Sage, 2013
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Yeh, Ling-hsia
Practical chinese reader II, III, IV, V : patterns and exercises
MA Cheng & TSui, 1994
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Qualitative research
edited by Alan Bryman, Robert G. Burgess
SAGE Publication, 1999
 Buku Teks SO