See the screenshot to have a look at how image citation (in APA style) will look like. 3] Create Reference List. You can also cite sources by creating separate slide for all your references.

PowerPoint 2007 does not have a tool that creates references, but you can still insert them on a slide and add a reference list to the bottom of the slide using tools that PowerPoint does have ...

Click "Insert Citation" from the Citations & Bibliography group, and select the appropriate reference from the list. The citation is automatically entered and formatted based on that selection.