Barbara Brenan's Hands of Light is pretty good. It shows what the chakras would look like in child hood and adult, and also works on the aura.

Its worth getting it from the library or having a look first, as its more about energy then chakras specifically.

http://www.goodreads.com/book/show/18420.Hands_of_Light

PS: the copy I have is pretty big - larger then A4 so it might cost for postage.