(ASA Style Guide 2014 section 5.4.3 p. 87, and appendix p. 116)
(Author Last name Year of publication)
Author Last name, First name. Year of publication. "Title of Presentation." Presented at, Month date, Location. Retrieved Month date, year (URL).
Berger, Alan S. 2010. "Sociological Research Methods and Techniques." Presented at City Colleges of Chicage, 2010, Chicago. Retrieved June 29, 2017 (http://faculty.ccc.edu/aberger/201.04%20Sociological%20Research%20Methods.ppt).