![Hdt physics extension andhdt bbp](https://cdn3.cdnme.se/5447227/9-3/1_64e61dfaddf2b33c615a3cd3.png)
Click on any other reference to bring up a " Do you want to save the changes you made to the reference?" pop-up box.
![endnote online search journal articles endnote online search journal articles](https://click.endnote.com/static/images/home-page/nature-logo.png)
![endnote online search journal articles endnote online search journal articles](https://s3.amazonaws.com/libapps/accounts/90060/images/SAGE_journals_abstract_view.jpg)
METHOD A: Manually attach a PDF to an existing reference Purpose You can add full-text PDFs to existing references in your EndNote Desktop library using either one of the two options below.
![Hdt physics extension andhdt bbp](https://cdn3.cdnme.se/5447227/9-3/1_64e61dfaddf2b33c615a3cd3.png)