Biber, D.1995: Dimensions of register variation: a cross-linguistic
comparison.
Cambridge University Press
.
2.
Holmberg, B.
,
Monica Shelley, M.
and
White, C.
, editors, 2005: Distance education and languages: evolution
and change.
Multilingual Matters
.
3.
Houk, N.
,
Biber, D.
,
Celce-Murcia, M.
,
Larson-Freeman, D.
and
Schmitt, N.2005: Current Research Perspectives and Grammar Teaching.
TESOL 2005 interest section academic session.
San Antonio, TX
. 30 March.