Gregorian Tower (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Gregorian Tower" in English language version.

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Manufacture française des pneumatiques Michelin (2007). Italia (in Italian). La Guida verde Michelin. p. 323. ISBN 978-2-06-712450-9.
Herbermann, Charles George; Pace, Edward Aloysius; Pallen, Condé Bénoist; Shahan, Thomas Joseph; Wynne, John Joseph (1913). The Catholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, Discipline, and History of the Catholic Church. Catholic Encyclopedia Incorporated. p. 310.
Ambrosini, Maria Luisa; Willis, Mary (19 February 1996). The Secret Archives of the Vatican. Barnes & Noble, Incorporated. pp. 327. ISBN 978-0-7607-0125-6.

"The Tower of Winds". Archivum Secretum Vaticanum. Archived from the original on 2 July 2013. Retrieved 9 May 2013.

Romero, George (18 March 2011). The Rescue. George Romero. pp. 220–. ISBN 978-1-4564-9962-4.

"The Tower of Winds". Archivum Secretum Vaticanum. Archived from the original on 2 July 2013. Retrieved 9 May 2013.

Hagen, Johann Georg (1913). "Vatican Observatory" . In Herbermann, Charles (ed.). Catholic Encyclopedia. New York: Robert Appleton Company.
Brock, Henry Matthias (1913). "Francesco Denza" . In Herbermann, Charles (ed.). Catholic Encyclopedia. New York: Robert Appleton Company.