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A cite is a a reference to a reputable source. They're the reason for all the s and other numbers all over articles. They can be used by doing this: "[urlhere namehere]". publisherhere (datehere).
</ref>. If you want to use the same cite for a second item, you can simply put on the other items. If you need any further assistance concerning cites or anything else wiki-related, feel free to join us on the chat :).