There are a great many useful readings. The following is not intended as a comprehensive listing but may help to give you a feel for range of materials that could support your process in this work. Books relating to mindfulness and psychotherapy are listed separately in the next section.
Baer R.E., 2005, Mindfulness-Based Treatment Approaches, First [...]

Recommended Reading
Kabat-Zinn J., 1990, Full Catastrophe Living: Using the Wisdom of Your Body and Mind to Face Stress, Pain and Illness. Delta.
Kabat-Zinn J., 2001, Mindfulness Meditation for Everyday Life. Piatkus.
Kabat-Zinn J., 2005, Coming to Our Senses: Healing Ourselves and the World Through Mindfulness. Piatkus.
Nhat Hanh T., 1991. The Miracle of Mindfulness, Rider
Nhat Hanh T., 1991. [...]