The following lists of references may be helpful in learning about XML, Docbook, and/or Maven: XML In a Nutshell by Elliotte Rusy Harold and W. Scott Means. Online at http://docstore.mik.ua/orelly/xml/xmlnut/index.htm. DocBook 5: The Definitive Guide by Normal Walsh. Online at https://www.safaribooksonline.com/library/view/docbook-5-the/9781449380243/. DocBook XSL: The Complete Guide by Bob Stayton. Online at http://www.sagehill.net/docbookxsl/. Maven: The Complete Reference by Tim O'Brien, Manfred Moser, John Casey, Brian Fox, Jason Van Zyl, Eric Redmond, and Larry Shatzer. Online at http://books.sonatype.com/mvnref-book/reference/index.html.