"loving someone with bipolar disorder" by Julie A. Fast and John D. Preston changed my life and my marriage. It is written to the spouse or partner of someone with bipolar. My husband finally understood about my illness when he read it.
For me, it gave me a glimpse of how I looked to others. Sort of stepped outside myself. But the book has lots of solid advice for stability and I follow it all, after 6 years. I am basically med free, except for sleeping pills because of the recommendations of the book.
I also loved "An unquiet Mind" but more from an experiential point of view than helping me control the bipolar.