• The Holy See. “Saint Catherine of Siena.” General Audience of Pope Benedict XVI, November 24, 2010.
• Encyclopaedia Britannica. “Saint Catherine of Siena.”
• Franciscan Media. “Saint of the Day: Saint Catherine of Siena.”
• Catholic Encyclopedia. “St. Catherine of Siena.”

Slides are written from The Acutis Project research packet for St. Catherine of Siena, which draws on the sources above. Photo credits appear on each picture.