Bibliography
Sources
"President's Council on Physical Fitness and Sports" (2004) http://www.fitness.gov/skiing.html
"Skiing Heritage: A Ski History Quarterly" (1996) http://www.skiinghistory.org/history.html
"Classic Techniques" (2004) Kenneth Roberts http://www.roberts-1.com/xcski
"Caldwell on Competitive Cross-Country Skiing", (1979), John Caldwell, Stephen Green Press
"A Trailside Series Guide: Cross Country Skiing" (1995), Brian Cazeneuve, W.W. Norton & Company