The Canadian Coalition for the rights of children and youth, a group of academics who have extensive material to back up the concept that physical punishment does harm and fails as a means of discipline. They recently had a webinar and that can be seen at https://rightsofchildren.ca/resources/ (it’s the first one webinar) or here on YouTube: https://youtu.be/Xss8AoZpPSEr. It was presented by Joan Durrant & Valerie Michaelson, and titled Canada’s Children Deserve Protection from Violence: A Call to Action.