Salverda, Reinier, author
University College London, 1990
Buku Teks
Victoria A. Fromkin
Blackwell Publishers, 2001
Buku Teks
Aitchison, Jean, 1938-, author
Hodder & Stoughton , 1992
Buku Teks
edited by William O`Grady and Michael Dobrovolsky; U.S. edition Prepared by Mark Aronoff
St. Martin's Press, 1997
Buku Teks
Lyons, John, author
Cambridge University Press, 1968
Buku Teks