A good review of mindfulness appears in the article “What Are the Benefits of Mindfulness: A Practice Review of Psychotherapy-Related Research” by Penn State researchers Daphne M. Davis and Jeffrey A. Hayes. The 2011 article, appearing in the journal Psychotherapy (Vol, 48, #2, pp.198-208) provides definitions and benefits of mindfulness.

The Gale Virtual Reference Library database has several in-depth topic overviews on mindfulness.