Citing Online Sources

What is the difference between citing a source that was found on the web and citing a source that is a web page? Some students need to learn the difference. It becomes a problem when the source-found-on-the-web is cited using a URL that includes a temporary access key. This happens with students using the online research databases they can access via our library information system, and it is something to be aware of the next time I have students finding sources online.