Office of Papal Liturgical Celebrations: Pope Pius IX
- Biographical article published in L'Osservatore Romano, 6 September 2000, and Pope John Paul II's homily at the beatification.
- http://www.vatican.va/news_services/liturgy/saints/ns_lit_doc_20000903_pius-ix_en.html

Patron Saints Index: Pius IX
- Illustrated profile. Includes a list of people he beatified or canonized.
- http://www.catholic-forum.com/saints/saintp0l.htm

Biography.com: Pius IX
- Brief biographical profile of Pio Nono.
- http://search.biography.com/print_record.pl?id=6358

Columbia Encyclopedia: Pius IX
- Short biography of this nineteenth-century pontiff.
- http://www.bartleby.com/65/pi/Pius9.html

Catholic Encyclopedia: Pope Pius IX
- Biography of this pope, who died in 1878.
- http://www.newadvent.org/cathen/12134b.htm

Popes Through the Ages: Pius IX
- Short account of his pontificate.
- http://www.cfpeople.org/Books/Pope/POPEp253.htm