An introduction to applied linguistics (2nd ed.) by Alan Davies, 1999
An introduction to sociolinguistics (5th ed.) by Ronald Wardhaugh, 1986
English corpus linguistics: an introduction by Charles F. Meyer, 2004
Linguistics: an introduction to linguistic theory by Victoria A. Fromkin (editor) et. al, 2000
The study of language (3rd ed.) by George Yule, 2006
