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 integrated within the Pentaho BI suite and covers all the necessary functions in a reporting tool .
This book explains simply and with several examples how you may create a report following a series of steps, no previous knowledge is required.
There are other more advanced books as http://www.packtpub.com/pentaho-reporting-3-5-for-java-developers/book