Book for Cambridge PET

[Maestro]

Hi.

I'm a new teacher. I have to start teaching an adult student who plans to take the Cambridge PET exam in May 2012. I was wondering if anyone could recommend a course textbook I could start using.

I only managed to find Exam practice books etc. during initial internet searches. So I presume there isn't an 'official' PET course book. So any suggestions welcome, thanks.