can anyone recommend some good potty training books for my ds?

[K8M]

hi
we're planning on potty training our ds who is 2.7 and i'm trying to find some good books for him that will encourage him to use his potty (as a potty, not as a store for toys!).
i'd be grateful if anyone could recommend something/anything!
kx

dd has "everything i know about the potty" by Kathryn Knight but i think its old as it was 2nd hand.
but she prefers the free dvd we had from huggies.

look on Amazon there are several
Has Anyone seen my Potty
I Want My Potty
The Boys Potty Book[American so I customised it with stickers-diaper to nappy,poop to poo and peepee to weewee.