Behrens-Abouseif, Doris (January 1, 2006). "The Islamic History of the Lighthouse of Alexandria". Muqarnas Online. 23 (1): 1–14. doi:10.1163/22118993-90000093. ISSN0732-2992.
Abdelnaby, Adel E.; Elnashai, Amr S. (October 2013). "Integrity assessment of the Pharos of Alexandria during the 1303 CE earthquake". Engineering Failure Analysis. 33: 119–138. doi:10.1016/j.engfailanal.2013.04.013.
Abdelnaby, Adel E.; Elnashai, Amr S. (October 2013). "Integrity assessment of the Pharos of Alexandria during the 1303 CE earthquake". Engineering Failure Analysis. 33: 119–138. doi:10.1016/j.engfailanal.2013.04.013.
Over twenty-three tons of silver. "This was an enormous sum, a tenth of the treasury when Ptolemy I assumed the throne. (In comparison, the Parthenon is estimated to have cost at least 469 talents of silver.)"[1]
Behrens-Abouseif, Doris (January 1, 2006). "The Islamic History of the Lighthouse of Alexandria". Muqarnas Online. 23 (1): 1–14. doi:10.1163/22118993-90000093. ISSN0732-2992.