"Conception Bastion – Valletta"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 14 September 2015.
"Conception Bastion – Valletta"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 14 September 2015.