Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2001
 Buku Teks SO
Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 1995
 Buku Teks
Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2013
 Buku Teks SO
Ammerlaan, T.
"You get a bit wobbly..." : exploring bilingual lexical retrieval processes in the context of first language attrition
Letteren, 1960
 Buku Teks
Progress in language planning: international perspectives / edited by Juan Cobarrubias, Joshua A. Fishman
Mouton, 1983
 Buku Teks SO