Saddall, Henry (1870). "History of Malta". Malta: Past and Present: Being a History of Malta from the Days of the Phoenicians to the Present Time. Chapman and Hall. p. 142.
"St.John's Co-Cathedral"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 December 2012. Archived from the original(PDF) on 3 March 2016.
"St.John's Co-Cathedral"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 December 2012. Archived from the original(PDF) on 3 March 2016.