Here are some book recommendations from Heart of Mindfulness organized by author.

Call to Love
Seek God Everywhere

Eight Mindful Steps to Happiness
Mindfulness in Plain English

The Power of Now
A New Earth

Being Zen
Beyond Happiness

In the Lap of the Buddha
Petals and Blood: Stories, Dharma and Poems of Ecstasy, Awakening and Annihilation

After the Ecstasy, The Laundry: How the Heart Grows Wise on the Spiritual Path
A Path with Heart: A Guide through the Perils and Promises of Spiritual Life
A Still Forest Pool, A Wise Heart

Coming to Our Senses
Full Catastrophe Living
Wherever You Go, There You Are

A Heart Full of Peace
Insight Meditation, the Practice of Freedom

Start Where you are
The Wisdom of No Escape
When Things Fall Apart: Heart Advice for Difficult Times

A Heart as Wide as the World
Real Happiness: The Power of Meditation: A 28-Day Program
Real Happiness at Work
The Force of Kindness
The Revolutionary Art of Happiness