ISCAD ANNOTATED BIBLIOGRAPHY: VISIBILE PARLARE L. Faibisoff (Toronto, CMS) Last update: May 1st, 2019 Download PDF Main References to Visibile Parlare in Dante’s Works (and sources) Augustine, De doctrina christianaiii.4: “Signorum igitur, quibus inter se homines sua sense communicant, quaedam pertinent ad oculorum sensum […] nam cum innuimus non damus signum nisi oculis […]