I really like this book, which my T and I are doing together. It's based on the Internal Family Systems (IFS) model. But as you can see from the title, it doesn't require a T. In addition to the questions at the end of the chapter the book has an accompanying website with additional worksheets.

Jay Earley, PhD, Self-Therapy: A Step-By-Step Guide to Creating Wholeness and Healing Your Inner Child Using IFS, A New, Cutting-Edge Psychotherapy