Check out anything by Zig Ziglar -> Napoleon Hill -> Andrew Carnegie and Tony Robbins. People miss that sales is not just technique or what you say but state o

Check out anything by Zig Ziglar -> Napoleon Hill -> Andrew Carnegie and Tony Robbins. People miss that sales is not just technique or what you say but state of mind, belief and confidence. Stay away from sales only focus books. If you really want to learn something check "Mastery" by Robert Greene.