Java Tools for Extreme Programming: Mastering Open Source Tools, Including Ant, JUnit, and Cactus by Richard Hightower, Nicholas Lesiecki ( ErikHatcher contributed to Ant sections ) published by John Wiley & Sons, Inc. - http://www.wiley.com/cda/product/0,,047120708X,00.html
Documentation
Appendix E of Java Development with Ant is included in the Ant 1.5.1 distribution