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Harahap, Syahrin, author
Prenada Media, 2011
Buku Teks
International Reformed Evangelical Seminary and Westminster, 2016
Majalah, Jurnal, Buletin
Aloys Budi Purnomo, author
Kompas, 2003
Buku Teks
Sukidi Mulyadi, author
Kompas, 2001
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