Opera Singers of Yesteryear - Biographies and sound clips of many early 20th century operatic performers. bassocantante.com/opera/singers.html
Twentieth Century Opera - A brief analysis of opera in the 20th century. www.infoplease.com/ce6/ent/A0860142.html
Who Was Who in the D'Oyly Carte Opera Company - A directory, photo gallery, and biographical resourse devoted to those who performed with the company between 1875 and 1982. diamond.boisestate.edu/gas/whowaswho
