If you retrieved lecture documents (not a journal article or an item available freely online) through a password protected portal such as D2L, you should not include the long URL from the D2L entry, instead use the homepage of Blackboard (i.e. Blackboard website: http://blackboard.gwu.edu).
NOTE: When citing online lecture notes, provide the file format in brackets after the lecture title (e.g. [PowerPoint], [PDF] documents).
Frank, B. (2015). Lecture 4: Psychophysiology [PowerPoint slides]. Retrieved from https://blackboard.gwu.edu/webapps/blackboard/content listContent.jsp?course_id=_241832_1&content_id=_6002642_1
APA has rules to support clear and concise writing and attribution of work but there are areas where they do not have a specific rule - and PowerPoint is one of them.
So how to include references in PPT? Use the following best practices but please note you should ALWAYS check with your instructor on their APA citation style preferences for PPT.
Question: Should I include my references on each slide or at the end of the PPT?
Question: How do I cite an image, table and/or figure on a PPT slide?
Question: Should my references be double spaced or single spaced?