To cite a PowerPoint from a website in APA, you can use the following format:
Author, A.A. (date). Title of PowerPoint [PowerPoint slides]. Retrieved from webpage URL
The example below was taken from the Purdue OWL APA Formatting and Style Guide:
Roberts, K. F. (1998). Federal regulations of chemicals in the environment [PowerPoint slides]. Retrieved from http://siri.uvm.edu/ppt/40hrenv/index.html
