Jabarkan Lihat pula dari Yakobus

Richard A. Fletcher, 1984. Saint James's Catapult: The Life and Times of Diego Gelmírez of Santiago de Compostela (Oxford University Press) (On-line text)

R. A. Fletcher, Saint James's Catapult: The Life and Times of Diego Gelmírez of Santiago de Compostela Oxford University Press, 1984: chapter 3, "The Early History of the Cult of St. James"