Author, A. A. (Year, Month Days of Conference). Title of poster session [Poster presentation]. Conference Name, location. http://xxxxx
Rusk, F. (2019, April 10–13). Beyond the research paper: Engaging faculty in alternative information literacy activities and assignments [Poster presentation]. Academic Colleges & Research Libraries, Cleveland, OH, United States.
As in-text citation:
(Rusk, 2019)
Source: Publication Manual, 10.5 (example 62)