Here are some great links to information I have found really useful for my own personal development. I hope you find them useful too!
Louise Hay – My Favourite Mentor for Positive Affirmations
The Modern day Father of Motivation
Wayne W. Dyer, Ph.D.
Doreen Virtue – Angel Intuitive Work
The Power of Now
The Law of Attraction
The Biology Behind Our Beliefs
The Power of Positive Thinking
The Study of Positive Psychology