↑ "Giuseppe Verdi: La Vita" on magiadellopera.com (in Italian)] notes: "On ngày 18 tháng 6 năm 1840 Margherita Barezzi's life was cut short by violent encephalitis."
↑ "Giuseppe Verdi: Sommario" on reocities.com (in Italian):] "...on 20 [sic] June 1840 his young wife Margherita died, struck down by a severe form of acute encephalitis."
↑ "Margherita Barezzi" on museocasabarezzi.it (in Italian) notes: "She died the following year [1840] on 18 June, aged only 26 years, while Verdi was working on his ill-fated second opera, Un Giorno di Regno."
