• The Holy See. “Padre Pio of Pietrelcina (1887-1968): Biography.” Vatican website, vatican.va.
• Franciscan Media. “Saint of the Day: Saint Pio of Pietrelcina.” Franciscan Media, franciscanmedia.org.
• Capuchin Friars. “Saint Pio of Pietrelcina.” Shrine of Saint Pio, San Giovanni Rotondo, santuariopadrepio.it.
• Vatican News. “Saint Pio of Pietrelcina.” Vatican News, vaticannews.va.
• Encyclopaedia Britannica. “St. Padre Pio.” Britannica, britannica.com.

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