https://en.wikipedia.org/wiki/Socialism_in_Italy#:~:text=Italian%20socialism%20divided%20into%20two%20major%20parties%2C%20the,and%20independent%20socialist%20movement%20after%20World%20War%20II.
https://fr.wikipedia.org/wiki/Costantino_Lazzari
https://fr.wikipedia.org/wiki/Parti_socialiste_italien
https://www.cairn.info/histoire-generale-du-socialisme-2--9782130363699-page-237.html
https://jean-jaures.org/nos-productions/la-sfio-et-la-scission-du-socialisme-italien-de-1947