Hi !
I've used the A319/320 Professional Pilot Study Guide from Impact Ink;
As we're not really allowed to give URLs, google it as Immpact Ink pilot store.
There is another manual, the "Quick Study Guide" that you could like better.
and some MCDU programming booklets./
There is a lot more than you would need.
What I liked with the "Systems Guide" is the introduction to a philosophy and not just a learning-by-rote manual.
And welcome to the fraternity of the 'Bus drivers.