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Works
Ad Salutem, Ingravescentibus Malis, Lux Veritatis, Rerum Omnium Perturbationem, Rite Expiatis
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Columbia Encyclopedia: Pius XI
http://www.bartleby.com/65/pi/Pius11.html
Biographical article.
Pope Pius XI
http://www.catholic-forum.com/saints/pope0259.htm
Illustrated profile.
Popes Through the Ages: Pius XI
http://www.cfpeople.org/Books/Pope/POPEp257.htm
Short essay on his life and character.