Voegelin, C.F.
Classification and index of the world's languages / C.F. and F.M. Voegelin
Elsevier, 1977
 Buku Teks
Language classification : history and method / Lyle Campbell and William J. Poser
Cambridge University Press, 2008
 eBooks
Barr, Donald F.
Languages of Central Sulawesi : checklist, preliminary classification, language maps, wordlists / by Donald F. Barr, Sharon G. Barr in cooperation with C. Salombe
Percetakan Universitas Cenderawasih, 1979
 Buku Klasik
Wurm, Stephen Adolphe, 1922-, author
Papuan languages of Oceania
Narr, 1982
 Buku Teks
Katzner, Kenneth, author
The languages of the world
Routledge, 1995
 Buku Referensi
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