DocBook 5.1: The Definitive Guide
DocBook 5: The Definitive Guide is Copyright © 2010-2013 Norman Walsh.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, as spelled out in the book's legal notice.
Version 1.4.14 is DocBook 5: The Definitive Guide. It is a “work in progress” and purports to document DocBook V5.1CR3.
The current OASIS Standard version of DocBook is V5.0. Documentation for DocBook V5.0 is also available.
Jiří Kosek built a Microsoft HTML Help version of V1.3.