Below is my main list.
Aspects of the novel - E. M. Forster.
George Orwell - Politics and the English Language.
Materials and Methods of Fiction - Clayton Meeker Hamilton.
Stephen King - On Writing.
Sol Stein - Solutions for Novelists: Secrets of a Master Editor
Elements of Style - E B White & William Strunk Jnr
Writers on Writing - Walter Allen.
Reading a Novel - Walter Allen.
The Short Story in English - Walter Allen.
The English Novel - Walter Allen
Tradition and Dream - Walter Allen
None.
I'm too busy writing.
When I don't know how to cook a dish I read a recipe book but when I do know I don't bother to read how to do it.
I have non-fiction on awkward technical subjects (chicken and egg concepts involved) published with some good reviews by "people wot know". As far as the fiction goes - I'm prepared to take my chances and see what happens.
I do not feel that I will significantly improve anything by cramming my head with other peoples' concepts - let alone by trying to follow definitions and rules.
Grammar is significant - but, once reasonably understood, should be used as a guideline not a immutable codex. .
:-)