Kabat-Zinn, J., Full Catastrophe Living: Using the Wisdom of Your Body and Mind to Face Stress, Pain and Illness (Piatkus, 1990), pp. 92–3; Williams, J. M. G., Teasdale, J. D., Segal, Z. V. & Kabat-Zinn, J., The Mindful Way Through Depression: Freeing Yourself from Chronic Unhappiness (Guilford Press, 2007), pp. 104–6.