Many subscription databases provide helpful citation generators to get you started on your citation.
Many of them are pretty good, but you must proofread them for accuracy and formatting. In most cases, there is at least one thing wrong with them.
For example, the title might be in ALL CAPS, the citation is not indented or double-spaced, or the date might be in the wrong format.
In most cases, you will see an icon that looks like one of these:
You will be asked to select a citation style, MLA, APA, Chicago, etc.
After you make a selection, you may copy and paste the generated citation, and add it to your Works Cited, References, Bibliography, etc.
Remember to always proofread and edit these citations to ensure they are accurate and in the proper format.
Use the citation brief guides, online citation websites such as Purdue Owl, or the APA Guide, etc. to check for accuracy.
Good luck, and work with a librarian if you need help!