1. Open the WORD document you want to manipulate, and then click the References tab on the toolbar above.
2. Stop the cursor where you need to add a reference mark, find the footnote option, and then click Insert Footnote.
3. It can be found that the corresponding serial number will be automatically added to this position. At the same time, the cursor jumps to the end of the page, and related reference files can be entered after the serial number.
4. Return to the main document and find that word has completed the annotation operation of adding the referenced document.