[1] Action - schema.org Type (10/7/2020, 3:29:44 AM) https://schema.org/Action

[2] schema blog: Announcing Schema.org Actions (9/19/2020, 8:03:23 AM, 10/7/2020, 3:31:22 AM) http://blog.schema.org/2014/04/announcing-schemaorg-actions.html

[3] Schema.org Actions - schema.org (10/7/2020, 3:31:30 AM) https://schema.org/docs/actions.html