Verstappen, H. Th.
A geomorphological reconnaissance of Sumatra and adjacent islands (Indonesia) / H. Th. Verstappen
Wolters-Noordhoff , 1973
 Buku Teks
Amalia Umi Nafingah, author
Penentuan struktur daerah sumatra bagian utara berdasarkan metode multi scale – second vertical derivative (MS-SVD) data satelit gravitasi = Determination of the structure of the northern sumatra based on multi scale – second vertical derivative (MS-SVD) method gravity satellite data.
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2021
 UI - Skripsi (Membership)
Manusia rimba : bunga rampai dongeng Sumatra-Utara /editor Shafwan Hadi Umry
Pusat Bahasa, 2003
 Buku Teks
North Korea seen from abroad
Korea Information Service Inc., 1976
 Buku Teks
Impressions of Korea
Foreign Languages Publishing House , 1960
 Buku Teks
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