Roosna, Märt (14 January 2016). "Pika karjääri lõpetanud Indrek Tobreluts: toredad aastad olid" [The end of the long career of Indrek Tobreluts: they were wonderful years]. Eesti Päevaleht (in Estonian). Retrieved 8 March 2016. (in Estonian)(subscription required)
"Ringen legger opp" [Ringen retires]. Trønder-Avisa (in Norwegian). 31 March 2016. Archived from the original on 12 August 2017. Retrieved 12 August 2017.(subscription required)
"Ringen legger opp" [Ringen retires]. Trønder-Avisa (in Norwegian). 31 March 2016. Archived from the original on 12 August 2017. Retrieved 12 August 2017.(subscription required)