Brandon Gaudiano has done a great deal of research in contextual behavioral approaches related to clinical work. His website at Brown University is a treasure trove of great publications that you can download, read, and apply.  He also has a new book titled Incorporating Mindfulness and Acceptance into the Treatment of Psychosis: Current Trends and Future Directions. It is available on Amazon, and you can get to that bookstore by clicking through the ACBS website.  Whether you treat individuals with serious mental illness or not, Brandon discusses important points for anyone applying the ACT model in treatment. Enjoy!