Integrating and Extending BIRT: Jason Weathersby, Tom French, Tom Bandur, ISBN-10: {{amazon>en:0321443853}, ISBN-13: 978-0321443854
BIRT. A Field Guide to Reporting: Diana Peh, Alethea Hannemann, Nola Hague, ISBN-10: 0321442598, ISBN-13: 978-0321442598 (This book is old and does not cover important aspects of the current Birt 2.2.)