Please check the below sources for a quick beginning research on international humanitarian law
What Is International Humanitarian Law? (ICRC, 2 pages)
International Humanitarian Law (European Commission, 2 pages)
Hans-Peter Gasser, Humanitarian Law, International (CWRU law patrons; Dec. 2015, Max Planck Encyclopedia of Public International Law).
Law students may schedule a Personal Research Consultation ("PERC") with one of the librarians.