* [https://web.archive.org/web/20071228211800/http://xoomer.alice.it/leiacopi/ancora.htm] An old page by Letizia Jacopini
* [https://web.archive.org/web/20071228211800/http://xoomer.alice.it/leiacopi/ancora.htm] An old page by Letizia Jacopini
* [https://www.ancora1919.com/it/history-and-production/] History section of the official site.
* [https://www.ancora1919.com/it/history-and-production/] History section of the official site.
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* [https://www.penciclopedia.it/681/errata-corrige-leta-di-giuseppe-zanini/#comment-19646] A statement by Giuseppe Zanini's grandson who also clarifies the reason for the two surnames.