Here are several of my go-to books on juvenile, or early-onset, bipolar disorder.
This is the definitive guide, the one that the child psychiatrist asked us to check out as he was making the diagnosis. There's also a website.
Bipolar Child website
This one -- a book by a mom with bipolar children who cowrote with a medical expert -- has an easy-enough format that even when I'm panicked over some situation we're in, flipping madly through the book trying to find some help, I can find it.
It has grids about different levels of the illness and how to parent each level. I really really find those helpful.
This one is a great over-all about the illness itself, not specific to parenting bipolar kids but very helpful.