Kereta Api, [date of publication not identified]
Buku Teks
Gregorius Seto Harianto, author
Lembaga Pangkajian MPR RI, 2016
Artikel Jurnal
Hadi Setia Tunggal, author
Harvarindo, 2005
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Tambunan, A., author
Bina Cipta, 1985
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Marpaung, Happy, author
Binacipta, 1987
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