May I suggest
A Fierce Domain: Conflict in Cyberspace, 1986 to 2012
http://www.amazon.com/Fierce-Domain-Conflict-Cyberspace-1986/dp/098932740X
The Tallinn Manual on the International Law Applicable to Cyber Warfare
http://www.ccdcoe.org/249.html
and a whole lot of ongoing things at
http://www.lawfareblog.com/
--dan