if you need to put it in reference too (some prof require some not) tehn this :
Applebee, F. (1993, January). Reducing the federal deficit. Lecture delivered at Dartmouth College at the Rockefeller Symposium, Dartmouth College, Hanover, NH.
The best approach to citing information from your own personal notes from a class lecture seems to be to consider it as a “personal communication” because it includes “unrecoverable data.” For this reason, personal communications are only cited within the text and are not included in the reference list.