"Triton Fountain"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 December 2012. Archived from the original(PDF) on 11 January 2018.
"Advanced Ditch – Valletta"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 26 August 2016.
"Triton Fountain"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 December 2012. Archived from the original(PDF) on 11 January 2018.
"Advanced Ditch – Valletta"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 26 August 2016.