Host, A. A. (Host). (Year, Month Day). Episode title (No. XX) [Audio podcast episode]. In Title of podcast. Production Company. http://xxxxx
Mars, R. (Host). (2019, September 30). The help-yourself city (No. 375) [Audio podcast episode]. In 99% invisible. Radiotopia. https://99percentinvisible.org/episode/the-help-yourself-city/
As in-text citation:
(Schmidt, 2017)
Source: Publication Manual, 10.13 (examples 93-94)