Q. When preparing a PowerPoint presentation how do you cite APA for the works you used throughout the presentation

APA doesn't specifically address PowerPoint presentations. Since there are no formatting guidelines, it can vary depending on who has put together PowerPoint presentation.

Classic APA

You could do classic APA styling... use an in-text citation after the information you're citing then include all your APA styled references on the final slide of the presentation.

Cite as you go

Often times presenters will include citation information on the slide with the cited information. Usually by including the reference at the bottom of the slide.