Byrne, Robert. "Chess", The New York Times, January 14, 1997. Accessed July 21, 2008. "Indeed, it was not until the International Tournament of 1851, held at the Crystal Palace of the London Exhibition, that tournament play entered the chess scene."
"G.W." (July–December 1840). "The Café de la Régence". Fraser's Magazine. 22. Retrieved 2008-06-06. (Jeremy Spinrad believes the author was George Walker)
