"ProSieben Maxx will 2014 zu HD Plus" [ProSieben Maxx wants to broadcast via HD+ in 2014]. Digitalfernsehen.de (in German). 10 September 2013. Retrieved 27 December 2013.
Schlüter, Jan (10 October 2012). "2013: Free-TV-Sender ProSieben MAXX kommt" [2013: Free-TV channel ProSieben is coming]. Quotenmeter.de (in German). Retrieved 27 December 2013.