"Enceinte along Kalkara side - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Post of Castile - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"St James Bastion - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"St James Cavalier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"French Curtain - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"St John Bastion - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"St John Cavalier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Couvre Porte Counterguard - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Remains of Caponier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Battery of Ditch - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Covertway - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Couvre Porte Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Advanced Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Main Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Enceinte along Kalkara side - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Post of Castile - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"St James Bastion - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"St James Cavalier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"French Curtain - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"St John Bastion - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"St John Cavalier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Couvre Porte Counterguard - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Remains of Caponier - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Battery of Ditch - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Covertway - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 13 July 2015. Retrieved 13 July 2015.
"Couvre Porte Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Advanced Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.
"Main Gate - Birgu"(PDF). National Inventory of the Cultural Property of the Maltese Islands. 28 June 2013. Archived from the original(PDF) on 14 July 2015. Retrieved 13 July 2015.