For anyone who may be interested. I have read some of these and they're very good. And you don't have to become a practicing Buddhist, a lot of this is very practical advice.

In short, they are:

1 - Any book by Pema Chödrön
2 - Training the Mind ~ Chögyam Trungpa
3 - The Shambhala Principle ~ Sakyong Mipham
4 - Turning the Mind into an Ally ~ Sakyong Mipham
5 - Cutting through Spiritual Materialism ~ Chögyam Trungpa
6 - Shambhala: The Sacred Path of the Warrior ~ Chögyam Trungpa
7 - Zen Mind, Beginner’s Mind ~ Shunryu Suzuki
8 - Dharma Art ~ Chögyam Trungpa
9 - How the Swans Came to the Lake ~ Rick Fields
10 - Crooked Cucumber. ~ Shunryu Suzuki
11 - Any book by Sharon Salzberg
12 - Any book by Jack Kornfield