6. The Happiness Project by Gretchen Rubin
Gretchen Rubin takes her readers on a journey as she shares the experiences of her yearlong project (what some have called a movement) to achieve a greater happiness in life.

7. Authentic Happiness by Martin Seligman
According to esteemed psychologist and bestselling author Martin Seligman, Authentic Happiness does not come about due to good luck or fate, but is the result of focusing on your strengths and skills (not your weaknesses), otherwise known as Positive Psychology.