Kumari Jayawardena
Institue of social Studies, 1982
Buku Teks SO
Brandt, Willy
Verlag Neue Gesellschaft , 1971
Buku Teks SO
Pauling, Linus
Jones and Bartlett Publishers, 2009
Buku Teks SO
Krieger, David
Middleway Press, 2002
Buku Teks SO
Tompkins, Andrew S.
Oxford University Press, 2016
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