The publications listed below provide useful information, frameworks and techniques

• Enterprise Architecture as Strategy, by Jeanne Ross, Peter Weill and David C. Robertson (Harvard Business School Press)
  (ISBN 1591398398)
• Design Patterns: Elements of Reusable Object-Oriented Software, by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides (Addison Wesley)
  (ISBN 0201633612)
• Patterns of Enterprise Application Architecture, by Martin Fowler (Addison Wesley)
  (ISBN 0321127420)