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Citation generators are tools in which you use a DOI or type the information regarding the citation (instead of pulling directly from a database or catalog) - they usually have a form to help guide you in what information is needed - and then they format it into the style you need.
For a jump start to a formatted citation:
Caveat: As with any tool like these, is it not guaranteed to be accurate all of the time. To be certain everything is perfect, consult the offical style manuals.
Get it at UC
Use "Get it at UC" and the Citation tool that is part of UC Library Search.
From Databases and Google Scholar
Databases and Google Scholar have a tool you can use look for a link or button with Cite
Citation Tools - ZoteroBib & Others
Use one of these tools to create a citation from a DOI, URL, ISBN, or other unique identifier. See list of options below.
Citation Tools for Any Type of Citation:
If you have the information about an article or book, you can use one of the tools below to put it in the right format.
Another library created tool - this time from NC State University Libraries. It has is the most simplified of the tools - choose the type of resource you have, fill out the information, and then select either APA or MLA citation style. Click Submit. It is ready to copy & paste.
The most robust of the tools and also the more difficult one to use. The advantage is the additional style types, particularly Engineering types. You will also be able to reuse citations, but you do have to type in the information.