If you're looking for some alternatives to Wikipedia, try searching for information in these collections of reference books. You'll be able to check facts and learn context for any number of topics.
An exhaustive (65 pages) compilation of electronic resources in humanitarian law covering current and historical sources, primary law, and the most important organizations and courts dealing with IHL.
Complied by the Peace Place Library at the World Court in The Hague, Netherlands, one of the best collections of international law materials in the world. The research guide includes a valuable bibliography of IHL books and articles.