I have 2 self-help books that works like charm! Great for all ages.

Title: The 7 Habits of Highly Effective Teenagers
Categories: Self-help
Author: Sean Covey
Language: English
Where you get that material: MPH Mid Valley
Comments: Now this book helps me as a teenager to become a better person, it is easy to read and has a little bit of humor in it, making it fun to read.

Title: How to win Friends and Influence People
Categories: Self-help
Author: Dale Carnegie
Language: English
Where you get that material: Kinokuniya
Comments: This book is like old but was re-released. So far, this book is great, it is the book that makes you think and reflect, pretty much like 7 High Effective Habits, only this one is more for the adults.