Most likely he's referring to this book:
B. Stahl & E. Goldstein, A Mindfulness-Based Stress Reduction Workbook
B. Stahl & E. Goldstein, A Mindfulness-Based Stress Reduction Workbook
Looking through chdir's comment history, the only reference to a book regarding meditation and stress is Mindfulness in Plain English by Bhante Gunaratana.
I'm interested in the book chdir's referring to as well.