1983 Grand Prix motorcycle racing season (English Wikipedia)

"Kenny Roberts career statistics". motogp.com. Retrieved 4 December 2012.
"Freddie Spencer career statistics". motogp.com. Retrieved 4 December 2012.
"1983 500cc Final Standings". motogp.com. Archived from the original on 21 June 2018. Retrieved 4 December 2012.
"1983 250cc Final Standings". motogp.com. Archived from the original on 17 September 2012. Retrieved 4 December 2012.
"1983 50cc Final Standings". motogp.com. Archived from the original on 20 September 2012. Retrieved 7 May 2014.

motorsportmagazine.com

"1983 World Motorcycle Championship". Motorsportmagazine.com. 9 October 2017. Retrieved 16 July 2018.

"Motorcycle Racing Memorium". motorsportmemorial.org. Retrieved 5 December 2012.

"Second Le Mans death". The Glasgow Herald. 4 April 1983. p. 16.
"Roberts says he will never again give an inch of track to Spencer". The Modesto Bee. Bee News Services. 12 August 1983. p. 15. Archived from the original on 11 January 2013. Retrieved 4 December 2012.

"Two Motorcyclists Die in Race Crash". The New York Times. United Press International. 1 August 1983.

"Michel Frutschi career profile". ozebook.com. Archived from the original on 4 November 2011. Retrieved 5 December 2012.

"Michel Frutschi career profile". ozebook.com. Archived from the original on 4 November 2011. Retrieved 5 December 2012.
"Roberts vs Spencer". cyclenews.com. Archived from the original on 15 July 2010. Retrieved 4 December 2012.
"1983 500cc Final Standings". motogp.com. Archived from the original on 21 June 2018. Retrieved 4 December 2012.
"1983 250cc Final Standings". motogp.com. Archived from the original on 17 September 2012. Retrieved 4 December 2012.
"1983 50cc Final Standings". motogp.com. Archived from the original on 20 September 2012. Retrieved 7 May 2014.

DeWitt, Norm (September–October 2012). "Franco Uncini – World Champion – Team Manager – Top Official". Classic Racer (157): 22–28. ISSN 1470-4463.