When in doubt, ask your instructor which citation style to use for your paper or project. Some of the most widely used citation styles are outlined in the links below.
Since 2000 there has been an effort to assign everything that exists in the digital world, e.g. online articles, with a unique number called a Digital Object Identifier or a DOI. The DOI is unique, permanent, and persistent. It remains the same despite changes in URLs or permanent removal from the internet.
In APA and AMA citation styles, use the DOI in citations whenever one is listed. See our FAQ for more information about DOIs, including what to do if you can't find the DOI.
These websites will assist you in building citations for your bibliographies. Always check your citations against a style manual to make sure they are correct.
