Learning Joomla! 1.5 Extension Development: Creating Modules, Components, and Plugins with PHP oleh Joseph L. LeBlanc

A practical tutorial, based around the development of coherent example throughout the book. Each chapter walks you through the steps to add a required feature to the extension. This book is suitable for PHP programmers who want to take their first step in customizing and extending the features of Joomla! through custom PHP development. It is not a reference guide for advanced Joomla! developers. You need only the basics of PHP programming; no experience of developing Joomla! extensions is assumed. You are expected to be familiar with the general operation of Joomla!