Encyclopedia of linguistics : volume 1
Philipp Strazny, editor
Fitzroy Dearborn, 2005
 Buku Referensi
Encyclopedia of linguistics : volume 2
Philipp Strazny, editor
Fitzroy Dearborn, 2005
 Buku Referensi
The Linguistics encyclopedia : second edition
edited by Kirsten Malmkjær
Routledge, 2004
 Buku Referensi
International encyclopedia of linguistics; Volume 1
William Bright, editor-in-chief
Oxford University Press, 1992
 Buku Referensi
International encyclopedia of linguistics; Volume 2
William Bright, editor-in-chief
Oxford University Press, 1992
 Buku Referensi