[1] Action - schema.org Type (2020-10-07T03:29:44.000Z) https://schema.org/Action

[2] schema blog: Announcing Schema.org Actions (2020-09-19T08:03:23.000Z, 2020-10-07T03:31:22.416Z) http://blog.schema.org/2014/04/announcing-schemaorg-actions.html

[3] Schema.org Actions - schema.org (2020-10-07T03:31:30.000Z) https://schema.org/docs/actions.html