Following is the list of very good books on SOA topic. I have used them as a reference and methodology for SOA.
Enterprise SOA:
Service-Oriented Architecture Best Practices
By Dirk Krafzig,
Karl Banke,
Dirk Slama
………………………………………..
Publisher: Prentice Hall
Pub Date: November 09, 2004
Print ISBN-10: 0-13-146575-9
Print ISBN-13: 978-0-13-146575-6
Pages: 408
Service-Oriented Architecture (SOA): A Planning and
Implementation Guide for Business and Technology
By Eric A. Marks , Michael Bell
………………………………………..
Publisher: Wiley; 1 edition
Pub Date: April 28, 2006
Print ISBN-10: 0471768944
Print ISBN-13: 978-0132344821
Pages: 384
SOA in Practice:
The Art of Distributed System
By Nicolai M. Josuttis
………………………………………..
Publisher: O’Reilly
Media, Inc.
Pub Date: August 24, 2007
Print ISBN-10: 0596529554
Print ISBN-13: 978-0596529550
Pages: 342
Service-oriented Architecture Compass:
Business Value, Planning, and Enterprise Roadmap
By Norbert Bieberstein, Sanjay Bose, Marc Fiammante, Keith Jones, Rawn Shah
………………………………………..
Published by FT Press, 2005
ISBN 0131870025, 9780131870024
232 pages
http://books.google.com/books?id=NISyExeJ5mAC&printsec=frontcover