Author page available at Amazon.
For AAT Level 1:
Award in Bookkeeping Study Guide
Award in Business Skills Study Guide
For AAT Level 2:
Introduction to Bookkeeping Study Guide, Skills and Knowledge Tests, Pocket Revision Guide
Principles of Bookkeeping Study Guide, Skills and Knowledge Tests, Pocket Revision Guide
Principles of Costing Study Guide, Skills and Knowledge Tests, Pocket Revision Guide
The Business Environment Study Guide, Skills and Knowledge Tests
For AAT Level 3:
Financial Accounting: Preparing Financial Statements Study Guide
Also:
Maths for AAT Accounting: Levels 1 & 2
Basic Bookkeeping (2nd edition)