My students are very good at putting the list references on their presentations, however, websites usually turn up as simply a link to the site. I’m now working on rectifying this. Because there are a lot of different types of online resources Yale Library has a few different ways to cite them. What I like the most, however, is that they give very clear examples of how to use them in the MLA, APA and Chicago styles. My preference is for the APA but to make sure and include the URL (like the citation at the bottom of this post).