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History of Pisa, Italy. (n.d.). Italy This Way. Retrieved August 23, 2022, from https://www.italythisway.com/places/articles/pisa-history.php

HOW was the Leaning Tower of Pisa stabilized? (n.d.). Leaning TOWER Pisa. Retrieved August 23, 2022, from https://leaningtowerpisa.com/facts/how-pisa-leaning-tower-was-stabilized

Law, E. (2018, June 7). The Secret Behind Why the Leaning Tower of Pisa Doesn’t Fall Over. Culture Trip. Retrieved August 23, 2022, from https://theculturetrip.com/e...