Sandler, Wendy
Sign language and linguistic universals
Cambridge University Press, 2006
 Buku Teks
Sign language and linguistic universals / Wendy Sandler, Diane Lillo-Martin
Cambridge University Press, 2006
 eBooks
Universals in linguistic theory
Holt, Rinehart and Winston, 1968
 Buku Teks
Linguistic universals / edited by Ricardo Mairal and Juana Gil
Cambridge University Press, 2006
 eBooks
Language universals : papers from the conference held at Gummersbach/Cologne, Germany, October 3-8, 1976 / Hansjakob Seiler
Narr Verlag , 1978
 Buku Teks