Brian Hunter (1905). "The Statesman's Year-book". CalendarioatlantedeAgostini, anno 99 [Agostini atlas calendar, year 99] (in Italian). 2003. The Columbia
ISBN 9781501732577. Kurt Witthauer. Bevölkerung der Erde (1958) CalendarioAtlantedeAgostini, anno 99 (2003) The Columbia Gazetteer of the World (1998) Britannica
"Italy". Europol. 7 March 2018. Retrieved 28 July 2019. del CalendarioAtlanteDeAgostini (in Italian). 2008. p. 207. "Speciale" (PDF). Retrieved 11 September