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SERTIFIKAT
Prof. Dr. Ir. Charles O.P. Marpaung, M.S, SCOPUS ID : 6603271958, Google Scholar, Universitas Kristen Indonesia, Jakarta, Indonesia
Elferida Sormin, S.Si., M.Pd, SCOPUS ID : 57210387509, Google Scholar, Universitas Kristen Indonesia, Jakarta, Indonesia
Decmoon Tampubolon, S.Pd, Universitas Kristen Indonesia, Jakarta, Indonesia
Tungkot Siregar, A. Md, Universitas Kristen Indonesia, Jakarta, Indonesia