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
Marketing Research
Carl McDaniel Jr., Roger Gates
Follow Up and Close the Sale: Make Easy (and Effective) Follow-up Your Winning Habit
Jeff Shore
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