Motivational books

[SlowHabit]

I'm currently looking for motivational books so I can help out a friend. I never understand why such books exist and the strategies/advices are cheesy but it seems like most people [or at least most that I know] aren't very motivated.

I am browsing Amazon but there are too many titles with 4.5 stars and I don't want to buy all of them only to find out they give the same advices.

If you don't know any motivation books, any book on how to deal with people [or persuasion] is fine.

Thanks!

PS. Another friend likes "The Power of Now" but he said it's BS after 5 chapters.