Campbell, George L.
Concise compendium of the world's languages
Routledge, 1995
 Buku Referensi
Katzner, Kenneth
The languages of the world
Routledge, 1995
 Buku Referensi
The World's major languages
edited by Bernard Comrie
Oxford University Press, 1987
 Buku Teks
The World's major languages
edited by Bernard Comrie
Routledge, 1991
 Buku Referensi
Machine translation of languages : fourteen essays
edited by William N. Locke and A. Donald Booth
MIT Press, 1965
 Buku Teks