• The Holy See. “Benedict XVI, General Audience: Saint Isidore of Seville.”
• Encyclopaedia Britannica. “Saint Isidore of Sevilla.”
• Franciscan Media. “Saint of the Day: Saint Isidore of Seville.”
• Catholic Encyclopedia. “St. Isidore of Seville.”

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