A book I have come across here in Australia that has helped me and my family understand my Bipolar 2 diagnosis is called "A Lifelong Journey - Staying well with Manic Depression/Bipolar Disorder" by Sarah Russell. (2005) Published by Michelle Anderson Publising Melbourne, wwwmichelleandersonpublising.com
It has great real life stories interspersed throughout the book which I could identify with and which my family could understand and realised they had noticed these things in me before.