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You can use a particular reference multiple times. When you place a reference, a <code><nowiki><ref>...</ref></nowiki></code> code will be generated. the <code><nowiki><ref></nowiki></code> tags tells the wiki that the text inside of them is a reference. To use one reference several times, you will need to name it. This is done by editing the generated ref tags by adding <code>name=...</code> with ... being the unique name of the reference. For example you can make a reference that will look like this: <code><nowiki><ref>DOE, John. On Editing a Wiki Article. Oxford Press, 2015</ref></nowiki></code> and then add the name <code>name="doe2015"</code> so the reference looks like this: <code><nowiki><ref name="doe2015">DOE, John. On Editing a Wiki Article. Oxford Press, 2015</ref></nowiki></code>. If you want to use the reference again somewhere else, you just write <code><nowiki><ref name="doe2015" /></nowiki></code> and the reference will link to the original one. No need to write the whole reference again.