« Mme. Frances Alda Wed To Ray Vir Den. Former Opera. Singer Bride Of New York Advertising Man », New York Times, (lire en ligne)
nytimes.com
« Frances Alda Dies. Former Met Star. 21 Years Before Retiring in 1929. Sang 40 Roles. A Gatti-Casazza Protege. Came to U.S. With Milanese Impresario in 1908. Stricken by Brain Hemorrhage », New York Times, (lire en ligne)
wikipedia.org
en.wikipedia.org
Selon l'American Art News source : American Art News, Vol. 8, No. 23, New York, March 19, 1910, p. 3., Adolfo Müller-Ury(en) a peint Alda, juste avant son mariage. Ce tableau a été perdu.