Internet Encyclopedia of Philosphy on Just War

http://www.iep.utm.edu/justwar/

Here is a link from the Internet Encyclopedia of Philosophy, which is a peer-reviewed academic resource.

The article provides a great deal of information in Just War theory from ancient times, all the way to its revival in the twentieth century with the rise of the nuclear age.

The article also touches on how just war theory was applied to the wars in Afghanistan and Iraq following the September 11th, 2001 attacks.