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
Percetakan Universitas Cenderawasih, 1979
 Buku Klasik
Wurm, Stephen Adolphe, 1922-
Papuan languages of Oceania
Narr, 1982
 Buku Teks SO
Katzner, Kenneth
The languages of the world
Routledge, 1995
 Buku Referensi
The World's major languages
edited by Bernard Comrie
Routledge, 1991
 Buku Referensi