The Purdue Online Writing Lab (OWL) is a good place to go for information about citing sources and style formats.
Digital Object Identifier (DOI) is a permanent marker for digital information. Because urls can change, DOIs offer stability so that information such as scholarly articles can always be found.
Find information using a DOI by entering the DOI number into the Resolve a DOI website.
For scholarly articles this often takes you to a publisher's website. If you are on campus and EMU has access, you will be able to get to the full-text content. From off-campus you will not be able to access the full-text.
Use the A to Z list of EMU periodicals to see if EMU has access to the content in question.