“Hildegard Beetz”, file dated October 26, 1943, archive file 25, Central Intelligence Agency.

John Gunther, Inside Europe (New York: Harper, 1940).

Ray Moseley, Mussolini’s Shadow.

Edda Mussolini Ciano, My Truth.

Mussolini and Zarca, Mussolini.

Vecchioni, “Quelle due belle spie”, n. p.

Ron Nowicki, The Elusive Madame G: A Life of Christine Granville (privately printed, 2014).

Romano Mussolini, My Father Il Duce.

Andrea Niccoletti, “The Decline and Fall of Edda Ciano”, n. p.

Giovanni Colli, “Confronto drammatico tra Edda e Frau Beetz: Il ’giallo’ dei diari di Ciano”, Il Tempo, June 6, 1989.