Rhapsody,

A book that deals exclusively with integration is Mending Ourselves: Expressions of Healing and Self-Integration by the Readers of Many Voices and Edited by Lynn W.

You can order it through their website

http://www.manyvoicespress.com/books.htm

Becoming One: A Story of Triumph Over Multiple Personality Disorder by Sarah Olson.

37 to One: Living as an Integrated Multiple by Phoenix J. Hocking

Beyond Integration: One Multiple's Journey by Doris Bryant

Multiple Journeys to One: Spiritual Stories of Integrating from Dissociative Identity Disorder by Judy Dragon, Terry Popp, Jonathan Rogers

Maybe reading about other's personal journies will be of some help?