Below are some resources you may find interesting and useful.
Mindfulness: A Practical Guide to Finding Peace in a Frantic World (by M. Williams and D. Penman)
The Mindful Way Through Depression (by M. Williams)
The Chimp Paradox: The Mind Management Programme to Help You Achieve Success, Confidence and Happiness (by S. Peters)
Who Moved My Cheese: An Amazing Way to Deal with Change in Your Work and Life (by S. Johnson)
The Power of Now (by E. Tolle)