References Morgan, Roger (1989). "European Derivatives of Tennis" in The Royal Game, L. St J. Butler & P. J. Wordie, ed. Stirling: Falkland Palace Real Tennis Club. or . McNicoll, Kathryn (2005). Real Tennis, pp. 21–22. Buckinghamshire: Shire Publications. . Whitman, Malcolm D. (1932). Tennis: Origins and Mysteries, p. 85. Mineola, NY: Dover Publications (2004 reprint). . External links Explanations from the palla21.it web site A brief description of the game with various visuals from recent games Ball games Sports originating in Italy Sport in Tuscany