IBU Congress (2012). "IBU Event and Competition Rules"(PDF). Rules adopted by the 2012 10th Regular IBU Congress. International Biathlon Union. Archived from the original(PDF) on 23 September 2015. Retrieved 29 June 2015.
Directors (2012). "Rules and Regulations". Cross Country Ski Canada. Archived from the original on 23 October 2014. Retrieved 4 November 2014.
crosscountryskier.com
Hindman, Steve (February 2004). "Poling Principles". Training & Technique. Cross Country Skier. Archived from the original on 29 November 2014. Retrieved 18 November 2014.
Hindman, Steve (2003). "Going Downhill". Training & Technique. Cross Country Skier Magazine. Archived from the original on 23 October 2014. Retrieved 21 October 2014.
"Ski". Merriam-Webster's Dictionary. Encyclopædia Britannica. Archived from the original on 12 August 2014. Retrieved 21 October 2014.
nb.no
urn.nb.no
Berg, Karin (1993). Ski i Norge (in Norwegian). Oslo: Aventura – Skiforeningen. ISBN82-588-0951-2. Archived from the original on 17 September 2020. Retrieved 25 December 2015.
IPC (2013). "Nordic Skiing Classification". IPC Cross-Country Skiing and Biathlon. International Paralympic Committee. Archived from the original on 4 December 2014. Retrieved 4 October 2014.
psia-nw.org
PSIA Standards Committee (June 2014). "Cross Country Certification Standards 2014"(PDF). Professional Ski Instructors of America. Archived(PDF) from the original on 7 November 2016. Retrieved 22 October 2014.
Bengtsson, Bengt Erik. "Cross-country skating: How it started". Skiing History Magazine. International Skiing History Association. Archived from the original on 23 October 2014. Retrieved 20 October 2014.
skixc.com
"Marathon Skate". Cross Country Ski Tips and Information. XCSki.com. 2010. Archived from the original on 4 January 2015. Retrieved 29 June 2015.
"DNT routes". Routes and cabins. The Norwegian Trekking Association. 2015. Archived from the original on 1 September 2015. Retrieved 29 June 2015.
uio.no
nob-ordbok.uio.no
"Nynorskordboka og Bokmålsordboka" (database search). Språkrådet (Language Council of Norway) and University of Oslo. Archived from the original on 21 September 2014. Retrieved 14 October 2014.
Directors (2012). "Cross Country Sport Committee". USSA Programs. U.S. Ski and Snowboard Association (USSA). Archived from the original on 5 November 2014. Retrieved 4 November 2014.
vismaskiclassics.com
Nilsson, David (2015). "Visma Ski Classics". Archived from the original on 13 May 2020. Retrieved 15 December 2015.
Berg, Karin (1993). Ski i Norge (in Norwegian). Oslo: Aventura – Skiforeningen. ISBN82-588-0951-2. Archived from the original on 17 September 2020. Retrieved 25 December 2015.
Bengtsson, Bengt Erik. "Cross-country skating: How it started". Skiing History Magazine. International Skiing History Association. Archived from the original on 23 October 2014. Retrieved 20 October 2014.
"Nynorskordboka og Bokmålsordboka" (database search). Språkrådet (Language Council of Norway) and University of Oslo. Archived from the original on 21 September 2014. Retrieved 14 October 2014.
"DNT routes". Routes and cabins. The Norwegian Trekking Association. 2015. Archived from the original on 1 September 2015. Retrieved 29 June 2015.
Directors (2012). "Cross Country Sport Committee". USSA Programs. U.S. Ski and Snowboard Association (USSA). Archived from the original on 5 November 2014. Retrieved 4 November 2014.
Directors (2012). "Rules and Regulations". Cross Country Ski Canada. Archived from the original on 23 October 2014. Retrieved 4 November 2014.
"FIS History". About FIS. International Ski Federation. Archived from the original on 7 August 2014. Retrieved 23 October 2014.
Nilsson, David (2015). "Visma Ski Classics". Archived from the original on 13 May 2020. Retrieved 15 December 2015.
"What is Worldloppet?". Worldloppet Ski Federation. 2012. Archived from the original on 25 October 2014. Retrieved 23 October 2014.
IBU Congress (2012). "IBU Event and Competition Rules"(PDF). Rules adopted by the 2012 10th Regular IBU Congress. International Biathlon Union. Archived from the original(PDF) on 23 September 2015. Retrieved 29 June 2015.
"Ski Orienteering". International Orienteering Federation. 2011. Archived from the original on 17 July 2015. Retrieved 29 June 2015.
IPC (2013). "Nordic Skiing Classification". IPC Cross-Country Skiing and Biathlon. International Paralympic Committee. Archived from the original on 4 December 2014. Retrieved 4 October 2014.
Hindman, Steve (February 2004). "Poling Principles". Training & Technique. Cross Country Skier. Archived from the original on 29 November 2014. Retrieved 18 November 2014.
PSIA Standards Committee (June 2014). "Cross Country Certification Standards 2014"(PDF). Professional Ski Instructors of America. Archived(PDF) from the original on 7 November 2016. Retrieved 22 October 2014.
Hindman, Steve (2003). "Going Downhill". Training & Technique. Cross Country Skier Magazine. Archived from the original on 23 October 2014. Retrieved 21 October 2014.