How to cite a reference using a superscript number in document

I'm writing a report and have been able to create a bibliography. Due to a limitation in the number of pages allowed, rather then citing a reference by the author and year (Smith & Tucker 2009), I need to use a number that corresponds to the reference in the document and on the reference page at the end of the report. I don't know if in Zotero there is a way to assign a number to a reference.
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