Books for A level English Language, mostly. I had to type 'Language' three times to get it right.
For ones that I can't list here, the EMC site is worth having a look at. The Language Handbook is here and the Language Laboratory is here.
Dan Clayton, Angela Goddard, et al.
Dan Clayton and Angie Kolaric
Dan Clayton and Rob Drummond
Dan Clayton
UK) Goddard Angela (, UK) Rana Raj (, et al.