PACKT Publishing
Writers: Mariano García Mattío, Dario R. Bernabeu
Paperback: 342 pages
Link to the book page.
Pentaho Report Designer is the best open source tool for creating reports. It is integratedwithin thePentahoBIsuiteand covers allthe necessary functionsin areporting tool.
This bookexplainssimply andwith several exampleshow you may create a reportfollowing a series ofsteps, no previous knowledge is required.
There are other moreadvanced booksas http://www.packtpub.com/pentaho-reporting-3-5-for-java-developers/book