Gjerde, Arild; Jeroen Heijmans; Bill Mallon; Hilary Evans (October 2010). "Karlo Umek Biography and Olympic Results". Olympics. Sports Reference.com. Archived from the original on 18 April 2020. Retrieved 17 October 2010.
web.archive.org
Gjerde, Arild; Jeroen Heijmans; Bill Mallon; Hilary Evans (October 2010). "Karlo Umek Biography and Olympic Results". Olympics. Sports Reference.com. Archived from the original on 18 April 2020. Retrieved 17 October 2010.