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James Elmes. "Catacombs" in A General and Bibliographic Dictionary of the Fine Arts. Thomas Tegg. London. 1826. Page 181 at 182.
Mary-Ann Gallagher. DK Eyewitness Travel: Top 10 Malta & Gozo. Dorling Kindersley. 2007. Revised, 2009. Pages 16 and 17.
Juliet Rix. "Roman/Byzantine Malta" in Malta and Gozo. Third edition. Bradt Travel Guides Ltd. November 2015. Page 87.