Modern Hagiography
“The Marvellous Sword” in Saints of Italy by Ella Noyes (Dent, 1901).
The True Story of the Sword in the Stone (an audiobook).
Contemporary Hagiography
Scholarly Articles
“San Galgano: A Cistercian Monastery of the Middle Ages” (photos of the ruins and a plan of the complex)
Art
Saint Galgano Showing Saint Michael the Sword in the Stone by Ambrogio Lorenzetti
Adoration of the Shepherds between Saints Augustine and Galgano by Giovanni d’Ambrogio
15C Saint Michael Leading Saint Galgano
Post-Biblical Saints Art Index
Medieval Religion Listserv – 2015 Dillon.
Nihil sub sole novum 