First, select your citation style from the View menu. This example shows APA as the selected style. You can use one of the listed styles or select from the "More Styles..." submenu.
To create a citation for a single item, right click on the item in your collection and select Copy as > Formatted Citation.
You can select multiple items and create a bibliography the same way.
You can paste your citations into your document.
Connecting Mendeley to Microsoft Word or LibreOffice lets you do even more! See the following links for details.
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