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Buku Teks SO
edited by Felicia Cox
Wiley-Blackwell , 2009
Buku Teks SO
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Buku Referensi
Peter S. Staats, Mark S. Wallace, editors
McGraw-Hill , 2015
Buku Teks SO
edited by Margaret Yerby
Bailliere Tindall, 2000
Buku Teks SO