Religious Freedom and the Universal Declaration of Human Rights by 
The International Covenant on Civil and Political Rights : Cases, Materials and Commentary by GCI Geneva Convention on Wounded and Sick in Armed Forces in the Field,1949
GCII Geneva Convention on Wounded, Sick and Shipwrecked of Armed Forces at Sea, 1949
GCIII Geneva Convention on Prisoners of War, 1949
GCIV Geneva Convention on Civilians, 1949
The Bodleian guide on International Humanitarian Law (via link below) may have useful tips
European Convention on Human Rights : a commentary by