Y Papa Piu IX (Amanung Latin: Pius PP IX, Mayu 13, 1792 – Pereru 7, 1878), mibait Giovanni Maria Mastai-Ferretti, iya ing [ekamaluat a makalukluk a Papa king kasalesayan ning Pisamban, a telanan ne ing Pisamban Romanu Katoliku manibat Juniu 16, 1846, anggang 1878, mga 32 banua. Inyang mumuna liberal ya, pepakawalan no reng pepasukul ning minuna kaya at kaibat meging yang conservative kaibat da reng pemate at gawang terrorista ampong inyang 1848 a aklasan. Likuan ne ing Roma inyang 1848 ketang makuyad a panaun at mewala la reng Papal states inyang 1870 at mipunta la keng Italy. Ela pane maluid ding tuntunan ning Pisamban kareng aliwang bangsa antimo ing Russia, Germany ampong France, uli ning pamanaliwa da reng secular institusiun ampong pangkilub a pamanalkus. Matas la lawe kang Papa Pio ampong kalguran de inyang panaun na. In kayang aus a pangmalda mabilug a yatu ing - Peter's Pence - kaibat nang meging "Makasukul king Vatican" ustu na para mika-atin yang ing papa (papacy) karing decadang daratang.
Acta et decreta Pii IX, Pontificis Maximi, VolI-VII, Romae 1854 ff
Acta et decreta Leonis XIII, P.M. Vol I-XXII, Romae, 1881, ff
Actae Sanctae Sedis, (ASS), Romae, Vaticano 1865
Barwig, Regis N.(1978). More Than a Prophet: Day By Day With Pius IX.Altadena:Benziger Sisters.
L. Boudou, Le S. Siege et la Russie, Paris, 1890
De Cesare, Raffaele(1909). The Last Days of Papal Rome.London:Archibald Constable & Co.
Hasler, August Bernhard(1981). How the Pope Became Infallible: Pius IX and the Politics of Persuasion.Doubleday.
Hasler, August Bernhard(1979). Wie der Papst unfelhlbar wurde: Macht und Ohnmacht eines Dogmas.R. Piper & Co. Verlag.
Kertzer, David I.(2004). Prisoner of the Vatican: The Popes' Secret Plot to Capture Rome from the New Italian State.Houghton Mifflin. ISBN 0-618-22442-4.
Martina, S.J. Pio IX (1846-1850) Roma: Editrice Pontificia Universita Gregoriana,Vol I-III, 1974-1991
Pougeois, Histoire de Pie IX, son pontificat et son siecle, Vol I-VI, Paris, 1877
Josef Schmidlin Papstgeschichte, Vol I-IV, Köstel-Pusztet München, 1922-1939
John Gilmary Shea, The Life of Pope Pius IX, New York, 1877
Sylvain, Histoire de Pie IX le Grand et de son pontificat, Vol I,II, Paris, 1878
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