Question: Reference for a Scholar's Lecture

F.A.Q. #10

Our psychology professor has provided us supplementary notes to his lectures to download, which I want to cite. They were written by himself, Markus Ebner, and two colleagues, Marion Eckler and Andreas W. Fischer in Vienna (2008), but there's no publisher of course because it's never been published. How must I quote this source? The name of the lecture is "Psychologie für Physiotherapiestudenten".

Thanks!