Pei, Mario A., author
The story of language / by Mario Pei
J.B. Lippincott, 1965
 Buku Teks
Eco, Umberto, author
The search for the perfect language
Fontana, 1997
 Buku Teks
Hankes, Elmer Joseph
A universal second language / Elmer Joseph Hankes
The Hankes Foundation, 1992
 Buku Teks
Funk & Wagnalls standard dictionary of the English language combine with Britanica world language dictionary : volume one
Encyclopaedia Britannica, Inc. ; Funk & Wagnalls Co., 1961
 Buku Referensi
Bloomfield, Leonard, author
Language
Holt, Rinehart and Winston, 1961
 Buku Teks