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Here is the most important thing about the book. The basic motivation for all people is to feel important, you can influence people by making them feel important.

But also hint at your ability to withdraw that confidence in someone if they don't live up to your expectations. Talk up someone's abilities while showing your high hopes in them are conditional on their actions.

I would add "Influence" by Cialdini under this category .

for sales- frank bettger- How I Raised Myself from Failure to Success in Selling

I mention it as a comment of this- as frank regularly quotes this book