Strauss, Anselm L., author
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Buku Teks
Strauss, Anselm L., author
Sage, 1998
Buku Teks
Neuman, Lawrence W., author
Pearson New International edition, 2014
Buku Teks
Hugo, Burkard, author
Quintessence, 2009
Buku Referensi
Hugo, Burkard
Quintessence Publishing, 2009
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