A few Eckart Tolle products I can recommend:

The Stress Management Program
Reduce your stress and anxiety levels and live a happier and healthier lifestyle. This is a 4 month weekly program to learn how to reduce your stress. Each week you will receive a new lesson with some action steps for you to complete.
The Stress Management Program

A+ Principals Interview Edge
101 Principals’ Interview Questions And Potential Answers To The Most Popular Questions Asked During School Administrator Job Interviews. This Book Gives Principals An Advantage At the Job Interview.
A+ Principals Interview Edge