The Clausewitz homepage at http://www.clausewitz.com/index.htm contains a variety of useful research resources, including indices and bibliographies.

The Sun Tzu Art of War site http://www.sonshi.com contains a translation of The Art of War, reviews of the other major translations, and other works of strategy online.

The US Military Academy’s Combating Terrorism Center https://ctc.usma.edu/ contains the Center’s reports, which include some insightful analyses of jihadist strategic theory and practice.

Military History Online http://www.militaryhistoryonline.com/ discusses many useful issues relevant to strategic theory along with a large number of case examples.

The Journal of Strategic Studies http://www.tandfonline.com/loi/fjss20 is the premier journal of strategic studies and frequently publishes articles on strategic theory.