M.L. Linda Tedja, author
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UI - Skripsi (Membership)
Hanafi Hartanto, author
Pustaka Sinar Harapan , 1996
Buku Teks
Jan Nopemly Sianipar, author
Universitas HKBP Nonmensen, 2017
Artikel Jurnal
Annabella R.M., author
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UI - Skripsi (Membership)
Rozana Hakim, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 1988
UI - Tesis (Membership)