Start with high-confidence rhetoric books, then narrow by subgenre or adjacent topics.
How to Read Nonfiction Like a Professor
Thomas C. Foster
Writing Theology Well
Lucretia B. Yaghjian
Virtues and Vices of Speech
Giovanni Gioviano Pontano, G. W. Pigman Iii
"they Say / I Say
Gerald Graff, Cathy Birkenstein
Rewriting
Joseph Harris
Office of Assertion
Scott F. Crider
The Art of Public Speaking
Dale Carnegie