The Flock: The Autobiography of a Multiple Personality by Joan Frances Casey (not read yet)
First Person Plural by Cameron West
(you can see an interview with him and his wife here:
http://www.huffingtonpost.com/2014/01/1 ... 91462.html )
Breaking Free by Herschel Walker
Which One Am I? by Thomas Smith & James Darrell Williams (not read yet)
Out of the ones already listed I really enjoyed Set This House in Order, When Rabbit Howls and A Fractured Mind.
When Rabbit Howls and Set This House in Order don't push unification, which is nice for us, as soon as we're currently aiming for co-con co-op only.
The author of a Fractured Mind has stated in an interview once that he doesn't expect they will unify either, though there were some "mergers" in the book.
The stranger in the mirror is a textbook not a biography or novel.
The Myth of Sanity by Martha Stout, though a little out of date, is also a neat book in the same vein.
Mind you, when it comes to textbooks
The Haunted Self is top dog for us.
I'm Mr. Meeseeks - Look at me!