Start with high-confidence sales & selling books, then narrow by subgenre or adjacent topics.
Selling the Invisible
Jeffrey Jones, Harry Beckwith
The Qualified Sales Leader
John McMahon, Dev Ittycheria
How I Raised Myself From Failure to Success in Selling
Frank Bettger
Marketing Research
Carl McDaniel Jr., Roger Gates
Follow Up and Close the Sale: Make Easy (and Effective) Follow-up Your Winning Habit
Jeff Shore
The Ultimate Sales Letter, 4th Edition
Dan S Kennedy
Way of the Wolf
Jordan Belfort
The Ultimate Sales Machine
Chet Holmes, Amanda Holmes
The Experience Economy, With a New Preface by the Authors
B. Joseph Pine II, James H. Gilmore
7l: the Seven Levels of Communication
Michael J. Maher
Exactly What to Say
Phil M. Jones, Lantern Audio