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Buku Teks SO
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Mizan , 2004
Buku Teks SO
Reformed Center for Religion and Society (RCRS), Pusat Pengkajian Reformed bagi Agama dan Masyarakat, 2018
Majalah, Jurnal, Buletin
editor, Martin L. Sinaga
Gramedia Widiasarana Indonesia, 2000
Buku Teks SO
Coward, Harold
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Buku Teks SO