Satyawati Sulaiman, author
Sculptures of ancient Sumatra
Pusat Penelitian Arkeologi Nasional, 1999
 Buku Teks
Voorhoeve, Petrus, author
Critical survey of studies on the languages of Sumatra
Martinus Nijhoff, 1955
 Buku Teks
Ekspedisi geografi Indonesia 2009 : Sumatra Utara
Agung Christianto, Andri Hernandi, Asymita Surbakti, Budi Brahmantyo, Budi Utomo
Badan Koordinasi Survei dan Pemetaan Nasional (Bakosurtanal), 2009
 Buku Teks
The ecology of Sumatra / Anthony J. Whitten ... [et al.].
Gadjah Mada Uni. Press,, 1987
 Buku Teks
The Ecology of Sumatra / Anthony J. Whitten ...[et al.]
Gadjah Mada University Press , 1984
 Buku Teks
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