- Immerse yourself into the Danish lifestyle: The Little Book of Hygge: The Danish Way to Live Well
- Deep introspection to be happier: The Happiness Project
- Remember the simplicity of happiness: Happiness 500 Things to Be Happy About
- A more spiritual discussion: The Book of Joy: Lasting Happiness in a Changing World
- Make it practical: 16 Guidelines For a Happy Life
- Ancient wisdoms intertwine with modern sciences: The Happiness Hypothesis
- Think humbly and ecologically: As in the Heart So in the Earth: Reversing the Desertification of the Soul and the Soil
There are plenty more out there, let me know which one inspired you!