Kat Eschner (जनवरी ६, २०१७), "One Time, They Closed the Leaning Tower of Pisa Because It Leaned Too Much", Smithsonian Magazine, अन्तिम पहुँच जुन १३, २०१९।
about Dante's primary sources developed by ISTI-CNR and the University of Pisa Dante Today वेब्याक मेसिन अभिलेखिकरण जनवरी ११, २०१८ मिति citings and sightings