The ISU Library provides support for three options: Zotero (free), EndNote (basic version free), and Mendeley (free). If you are new to this, our citation management tools Library Guide can help you get started.
I do not find the citation tool in this site as helpful or comprehensive to my students as it is missing some sources students use. A comprehensive, free, and quite simple site to use that I reccommend to my students: https://my.noodletools.com/web2.0/express.html