1. Wikipedia -speed skating (May 2014).
http://en.wikipedia.org/wiki/Speed_skating
2. D.L. Bird, Skating a brief history of ice and the national ice skating association of great Britain (May 2014).
http://www.iceskating.org.uk/about/history
3. Wikipedia -Edinburgh skating club (May 2014).
http://en.wikipedia.org/wiki/Edinburgh_Skating_Club
4. The edinburgh skating-club, with diagrams of figures and a list of the members. Edinburgh skating club (1865).
http://books.google.it/books?id=8CQ7MwEACAAJ
5. Wikipedia -international skating union (May 2014).
http://en.wikipedia.org/wiki/International_Skating_Union