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https://www.theatlantic.com/ideas/archive/2020/03/what-vaticans-secret-archives-are-about-reveal/607261/
https://www.cbc.ca/radio/asithappens/as-it-happens-wednesday-edition-1.5476724/vatican-set-to-open-secret-archives-of-controversial-wartime-pope-pius-xii-1.5476730
https://www.corriere.it/cultura/19_dicembre_14/1849-paradosso-tocqueville-pio-ix-contro-mazzini-garibaldi-9fc62ffe-1ea2-11ea-9389-bd538526c9e7.shtml?refresh_ce-cp
https://www.raiplay.it/video/2019/12/passato-e-presente---pio-ix-lultimo-papa-re-200244db-1ad0-4876-8f63-d1d665076406.html