Sweet, M. and I. McDonald, "Internet Printing Protocol/1.1: Encoding and Transport", STD 92, RFC 8010, January 2017. 

Sweet, M. and I. McDonald, "Internet Printing Protocol/1.1: Model and Semantics", STD 92, RFC 8011, January 2017.

<https://www.rfc-editor.org/info/std92>