ipv6 book recommendations?

[David Hubbard <dhubbard () dino hostasaurus com>]

Does anyone have suggestions on good books to really get
a thorough understanding of v6, subnetting, security practices,
etc.  Or a few books.  Just turned up dual stack with our
peers and a test network but I'd like to be a lot more
comfortable with it before looking at our customer network.

Thanks,

David