See E. Randall Floyd, 100 of the World's Greatest Mysteries (Harbor House, 2000), pp. 262–263; Lionel Fanthorpe and Patricia Fanthorpe, Mysteries and Secrets of the Templars: The Story behind the Da Vinci Code (Dundurn Press Ltd., 2005), p. 57.
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W. Eugene Kleinbauer, James Marrow and Ruth Mellinkoff, "Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America: Walter W. Horn," Speculum 71 (1996), p. 800 ("his most important piece of detective work led to the recovery of the coronation regalia of the Holy Roman Empire"); "Walter Horn," San Francisco Chronicle, 30 December 1995, obituary; University of California (System) Academic Senate, "1996, University of California: In Memoriam,"
"Walter Horn, History of Art: Berkeley" ("his most spectacular feat was the recovery of Charlemagne's ceremonial regalia").
W. Eugene Kleinbauer, James Marrow and Ruth Mellinkoff, "Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America: Walter W. Horn," Speculum 71 (1996), p. 800 ("his most important piece of detective work led to the recovery of the coronation regalia of the Holy Roman Empire"); "Walter Horn," San Francisco Chronicle, 30 December 1995, obituary; University of California (System) Academic Senate, "1996, University of California: In Memoriam,"
"Walter Horn, History of Art: Berkeley" ("his most spectacular feat was the recovery of Charlemagne's ceremonial regalia").
