For anyone is interested is having a copy of "Boundaries" When to say yes How to say no by Cloud & Townsend on their Kindle.
The price has been reduced from the last time I looked. I have the paperback and I had downloaded the free sample but had not gotten around to buying copy for my Kindle.
It is now $2.99. At that price it is worth putting on the Kindle even if you have the real book.