WRITING DOWN THE BONES By Natalie Goldberg "Freeing the writer within."
ON WRITING By Stephen King - He has some great one-liners in here, but most of the ones I like have swear words, so I won't give examples.

BIRD BY BIRD By Anne Lamott - Worth every penny.
CHILDREN'S WRITERS WORD BOOK By Alijandra Mogilner-"Lists of specific words introduced at each of seven reading levels."
WRITERS, INC-a student handbook/thumbnail reference for grammar, etc.
ELEMENTS OF STYLE By Strunk and White
A WRITER'S BOOK OF HOPE By Ralph Keyes
And this is just for personal inspiration:
OSGOOD'S PRIMER - Copyright 1888. It was my great grandfather's school book of first lessons. ABC's, etc.
and
THE NEW BUSY FINGERS PRIMER - Copyright 1924. Albert Whitman & Co. It was my dad's and comes complete with his doodles on every page. The opening lines are:
"Writing is putting on paper what your mind thinks.
Drawing is putting on paper what your eye sees."
Simple. Profound.
Love it.