Select the text you want to mark, click Insert Endnote in Reference, and then enter the reference in the endnote. The method is as follows:

1. Open the document and select the text to be marked in the document.

2. Then click the Reference menu above the document.

3. Select Insert Endnote in the reference option.

4. Then the cursor will automatically jump to the last note.

5. Enter the reference here.

6. In this way, you can see that the reference has been successfully marked.

Precautions:

This is the operation method of word 2009 version, and other versions can also refer to it.