(en) Jonathan Steinberg, All Or Nothing – The Axis and the Holocaust, 1941-43, éd. Routledge, Londres, 2002, 336 p. (ISBN 978-0-203-20034-6) (en) [présentation en ligne sur books.google.fr (page consultée le 11 avril 2010)], p. 67 : « [...] Cavallero told Pirelli [Alberto Pirelli] that Mussolini would have to make clear to their German ally' our disagreement on three points: treatment of the occupied countries, excesses towards Jews, and relation with the Papacy. »
