Whether here or elsewhere, be mindful in your choices. Works that are meant to change your perception, and teach you techniques of though and practical application require a commitment on your part. They are not quick fix-it trash. If you are not willing to take the time to put in the work, you will most likely fail and should just spend the money on a skinny chai latte instead.
On the other hand if you are buying our publications as coffee table decoration, choose as many as you wish.