“Un bel di”, Major Bowes Amateur Hour, 7 April 1935 (track 1)
Application note
Presentation letter
Callas' letter denying her singing under an assumed name
The Callas Legacy by John Ardoin
Maria Callas Remembered by Nadia Stancioff
Diva: Life and Death of Maria Callas by Steven Linakis

Royal Festival Hall Concert, London, 23 September 1959 (tracks 7-8)