“Drawing Sentences A guide to Diagramming,” by Eugene Moutoux, Butler Books Louisville (ISBN: 978-1-953058-66-9).
"The Elements of Style" (4th edition), by William Strunk, Jr. and E.B. White (ISBN: 0-205-30902-X)
“Style: Lessons in Clarity and Grace” (any edition is fine), by Joseph M. Williams (ISBN: 0-321-47935-1; this is for the 9th edition).
“The Chicago Guide to Grammar, Usage, and Punctuation,” by Bryan A. Garner, The University of Chicago Press (ISBN-10: 0-226-18885-X).