Works about St. Ignatius of Loyola

March 12. -- St. Gregory of Great -- from from Lives of the Saints with Reflections for Every Day of the Year
Catholic Encyclopedia, Volume 7: Gregory XII-Infallability -- from Herbermann, Charles George (1840-1916)
Ignatius of Loyola, St (1491-1556) -- from Wikipedia Article
St. Ignatius of Loyola -- from The New Schaff-Herzog Encyclopedia of Religious Knowledge