<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Eastwood, Bruce S.</hi> 2001. <emph xmlns="http://www.tei-c.org/ns/1.0">"</emph>The Diagram of the Four Elements in the Oldest Manuscript of Isidore’s 'De natura rerum'. <emph xmlns="http://www.tei-c.org/ns/1.0">"</emph> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Studi Medievali</hi> 42: 547-564.