The Clausewitz homepage http://www.clausewitz.com/index.htm is a comprehensive site for Clausewitz studies.

The US Army Center of Military History http://www.history.army.mil is a very good source on American military history.

US Army War College Quarterly: Parameters https://ssi.armywarcollege.edu/pubs/parameters/ offers online access to the US Army’s strategic studies journal.

Naval Warfare Blog http://navalwarfare.blogspot.co.uk has excellent links to a wide range of naval warfare sources.