How to cite a PowerPoint in APA Style (6th edition)

The APA reference for PowerPoint-slides and handouts depends on the accessibility. Are the slides accessible for the reader?

Slides are only available via: Blackboard, N@tschool, Moodle, Magister etc.

When the slides are part of a digital study database, you can just add a footnote in which you make clear that the source is only accessible via the digital study database.

Lecture slides (not publicly accessible)

APA-format	AuthorLastname, Initials. (Year, month day). Title of the document [Type document]. Retrieved from http://Website
In reference list	Ribbers, P. G. (2015, August 4). Introduction in ethics [Slides]. Retrieved from http://public-sheets.uvt.com/ethics/week1/class1
In the text	Research suggests … (Ribbers, 2015)1. Ribbers (2015)1 found that… .
In the footnote	1 Source derived from Blackboard Uvt (not publicly available).

Slides publicly accessible

Is the source publicly accessible, then the reference according to the APA Style is the same as for a normal internet source.

Lecture slides (publicly accessible)

APA-format	AuthorLastname, Initials. (Year, month day). Title of the document [Type document]. Retrieved from http://Website
In reference list	Ribbers, P. (2015, August 4). Introduction in ethics [Slides]. Retrieved from http://public-sheets.uvt.com/ethics/week1/class1
In the text	Research suggests … (Ribbers, 2015). Ribbers (2015) found that … .
Open example in the APA Citation Generator