There are other Bodleian Libguides which may also help depending on your focus:
After World War Two, all members of the United Nations undertook (among other goals) to ".... refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations." .Art 2 (4) of Charter of the United Nations (1 UNTS XVI, 892 UNTS 119)
A useful starting point would be to check MPEPIL (see link below) to see if it contains a relevant article.
As of January 2017 MPEPIL has for example:
Peacekeeping and Peace Enforcement by Patryk I Labuda
Peacekeeping Forces by Michael Bothe
Peacebuilding by Thilo Marauhn, Sven Simon
Peace, Proposals for the Preservation of - by Achilles Skordas
Transitional Justice in Post-Conflict Situations by Anja Seibert-Fohr
Demilitarization by Kees Kingma, Nico Schrijver
Reparations by Dinah Shelton
Use of Force, Prohibition of Oliver Dörr
Although this Libguide has been produced by the Bodleian Law Library staff, this is of course an area of research where SOLO will often point to useful titles held in a number of Bodleian Libraries. Below are guides to some of the other Bodleian Libraries which you may well be getting to know. But first things first a quick route to the Law Bod's website for our current opening hours etc!
National legal systems also have measures designed to ensure and protect the rights of its citizens & to ensure peace within its own borders.
For those within the British Isles the shelfmark for monographs will begin K - eg KM31 for English constitutional law. Other jurisdictions the first element of the shelfmark will be more obviously based on the country name eg S. Africa for South Africa.