Personal happiness is the measure of joy one experiences in his or her personal life. There have been many studies and books focusing on optimal personal happiness, including Martin Seligman's Authentic Happiness.
Personal Happiness Books
Authentic Happiness by Martin Seligman
Guide to Personal Happiness by Albert Ellis, Irving M. Becker, and Melvin Powers
Field Guide to Happiness: Finding Happiness in its Natural Habitat by Barbara Ann Kipfer
Templeton Plan: 21 Steps to Personal Success and Real Happiness by John Marks
Spiritual Intelligence: A Practical Guide to Personal Happiness by Khalil, Ph.D. Khavari