Jewish question
He has contributed personal essays in the books "Left Wing and Jewish question" (Editori Riuniti, 1989), "Modern Jews" (Bollati-Boringheri, 1989), "Besides the Ghetto" (Morcelliana, 1992) and "Annali Einaudi- Storia degli Ebrei d'Italia, vol. II" (Einaudi, 1997).