"1921 World Chess Championship". Archived from the original on January 20, 2005. Retrieved 2008-11-21. This cites: a report of Lasker's concerns about the location and duration of the match, in the New York Evening Post, March 15, 1911; Capablanca's letter of December 20, 1911 to Lasker, stating his objections to Lasker's proposal; Lasker's letter to Capablanca, breaking off negotiations; Lasker's letter of April 27, 1921 to Alberto Ponce of the Havana Chess Club, proposing to resign the 1921 match; and Ponce's reply, accepting the resignation.
"1921 World Chess Championship". Archived from the original on January 20, 2005. Retrieved 2008-11-21. This cites: a report of Lasker's concerns about the location and duration of the match, in the New York Evening Post, March 15, 1911; Capablanca's letter of December 20, 1911 to Lasker, stating his objections to Lasker's proposal; Lasker's letter to Capablanca, breaking off negotiations; Lasker's letter of April 27, 1921 to Alberto Ponce of the Havana Chess Club, proposing to resign the 1921 match; and Ponce's reply, accepting the resignation.
