Citation generators allow you to enter your source's bibliographic information (such as title and author for a journal article, web page, or book) in order to produce a citation in your selected format.
Check the citations generated through these tools, as they can make errors. The library has citation style guides.
Here is a selected list of citation generators:
Some library databases have built-in citation generators that allow you to click on a "Cite" button to get a citation for that article or book.