Following are some books that I recommend. My list changes from time to time, and I love getting
feedback about your experience in discovering these authors!

Radical Acceptance: Embracing Your Life with
the Heart of a Buddha, 
Tara Brach, Ph.D.

Radical Compassion:  Learning to Love Yourself and Your World with the Practice of RAIN
Tara Brach, Ph.D.

Rising Strong,
Brené Brown, Ph.D., LCSW 

When Things Fall Apart, Heart Advice for Difficult Times,  
Pema Chödrön

Being Mortal:  Medicine and What Matters in the End
Atul Gawande 

Healing Through the Dark Emotions:  The Wisdom of Grief, Fear, and Despair
Miriam Greenspan

When Breath Becomes Air
Paul Kalanithi

Mindsight: The New Science of Personal Transformation
Daniel J. Siegel, MD

The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma
Bessel van der Kolk, MD 

Consolations:  The Solace, Nourishment and Underlying Meaning of Everyday Words
David Whyte

DBT Skills Training Handouts and Worksheets, Second Edition, 
Marsha M. Linehan,Ph.D., ABPP

The Dialectical Behavior Therapy Skills Workbook:  
Practical DBT Exercises for Learning Mindfulness,
Interpersonal Effectiveness,Emotion Regulation &
DistressTolerance
Matthew McKay, Ph.D., Jeffrey C. Wood, Psy. D.,
Jeffrey Brantley, MD