Yalden, Jenice
Cambridge University Press, 1987
Buku Teks
Whatmough, Joshua
The New American Library, 1956
Buku Teks
edited by Francis M. Hult and David Cassels Johnson
Wiley Blackwell, 2015
Buku Teks
Ferguson, Gibson, author
Edinburgh University Press, 2006
Buku Teks
Florian Coulmas edited by
Cambridge University Press, 1989
Buku Teks