The company Deaf-Blind Training, Interpreting & Professional Development (DB-TIP) offers a number of recorded webinars aimed at interpreters. They are available for purchase on the website and are fairly expensive; however, CEUs are included. Not sure how you want to deal with these in the bibliography—whether they should be listed separately or together. Here’s the homepage (https://sites.google.com/site/deafblindtip/); look in the menu on the left side of the page to browse all the webinars they offer.
unknown, unknown, "DB-TIP" (1000). Interpreting Education. 4.