Marshall, F.J. (1960). Frank J. Marshall's Best Games of Chess. Dover. σελίδες 19–20. ISBN0-486-20604-1. Page 19: "My two 1913 tournaments took a curious course. At New York, Capa beat me out by half a point, but a month later I reversed the procedure at Havana." P. 20: Marshall thought the crowd were "after my blood for defeating their idol and asked for an escort to my hotel. It turned out, however, that the good Cubans were just showing their sportsmanship and were cheering me!"
«1921 World Chess Championship». 20 Ιανουαρίου 2005. Αρχειοθετήθηκε από το πρωτότυπο στις 20 Ιανουαρίου 2005. Ανακτήθηκε στις 21 Νοεμβρίου 2008.CS1 maint: Unfit url (link) This cites: a report of Lasker's concerns about the location and duration of the match, in 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.
