Items such as PowerPoint slides, whiteboard notes, or lecture’s statements may be included as an in-text reference, but are not included in the list at the end.
In a lecture for Diploma of Nursing (HC516) presented on 16 June, 2014 at Box Hill Institute, C. Power explained…
If, however, you are referring to presentation slides that are available online, e.g. Moodle, then you include these in the list at the end.
Box Hill Institute, 2013, Emotional inteligence and leadership [PowerPoint slides], Retrieved: June 16, 2014, from http://studentweb.bhtafe.edu.au/bhi/mod/resource/view.php?id=210846
The in-text citation for this example would be (Box Hill Institute, 2013).