Sometimes by browsing the stacks in a particular area, you can find something better than what you were originally looking for! Here are some selected subject headings for the law of war:
Crimes Against Humanity in International Criminal Law by 
Customary International Humanitarian Law
The Conduct of Hostilities under the Law of International Armed Conflict by 
The Law of Armed Conflict by 
The War on Terror and the Laws of WarSometimes helpful research sources for a particular area of the law have already been pulled together by someone else. Examples of print and electronic research guides on the law of war include the following:
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