From the Insert Reference To dropdown, choose Page Number—you want to display the page the bookmarked text is on, not the bookmarked text.

How to Insert a Reference in PowerPoint 2007. When you need to add helpful references to slides in your business presentations, you can use the same referencing system that the Royal Society of ...

You can add page numbers on Google Docs to any document. All you need to do is go into a document's Insert menu, which will give you several options.