DocBook Basics and References

DocBook provides a system for writing structured documents using SGML or XML. It is particularly well-suited to books and papers about computer hardware and software, though it is by no means limited to them.

dpawson.co.uk. Books>Documentation>XML>DocBook

DocBook: The Definitive Guide  

This book is designed to be the clear, concise, normative reference to the DocBook DTD. This book is the official documentation for the DocBook DTD.

Walsh, Norman and Leonard Muellner. Docbook.org (2003). Books>Documentation>XML>DocBook