What is the diference? Which should you use?
Just so you know, Medline is a subset of PubMed. We recommend that you always use the PubMed link from the list of MU Libraries databases. The library holdings will display if Marshall owns the journal/article.
For more information, the US National Library of Medicine has prepared a Fact Sheet on this topic.
Here are some quick-guides to help you with citing your resources.