Kitzinger, Ernst. The Arts as Aspects of a Renaissance: Rome and Italy. In Benson, Robert L.; Constable, Giles & Lanham, Carol Dana. Renaissance and renewal in the twelfth century. Volume 26 de Medieval Academy reprints for teaching da Mass Medieval Academy of America Cambridge. University of Toronto Press, 1991. pp. 637-669
Gschwantler, Kurt. Graeco-Roman Portraiture. In Walker, Susan (ed). Ancient faces. British Museum & Metropolitan Museum of Art, Taylor & Francis. pp. 14-ss
Maier, Harry O. Barbarians, Scythians and Imperial Iconography in the Epistle to the Colossians. In Weissenrieder, Annette; Wendt, Friederike & Von Gemünden, Petra (eds). Picturing the New Testament: studies in ancient visual images. Volume 193 de Wissenschaftliche Untersuchungen zum Neuen Testament. Mohr Siebeck, 2005. pp. 385-386
Plínio, o Velho. Natural history, a selection, XXXV. Classics Series. John F. Healy (trad). Penguin Classics, 1991.
Perry, Ellen E. Rhetoric, Literary Criticism, and The Roman Aesthetics of Artistic Imitation. In Gazda. Elaine K. The Ancient Art of Emulation: studies in artistic originality and tradition from the present to classical antiquity. Volume 1 de Supplements to the Memoirs of the American Academy in Rome. University of Michigan Press, 2002. pp. 153-172
In Cameron, Alan. Greek mythography in the Roman world. Volume 48 de American classical studies. Volume 48 de American Philological Association American Classical Studies Series. Oxford University Press US, 2004. p. 223
Morales, Helen. The Torturer's Apprentice. In Elsner, Jaś. Art and text in Roman culture. Edição 5760, Cambridge studies in new art history and criticism. CUP Archive, 1996. pp. 190-191
In Davis-Weyer, Caecilia. Early medieval art, 300-1150: sources and documents. Edição 5975. Volume 17 de Sources and documents in the history of art series. Volume 17 de Medieval Academy reprints for teaching. University of Toronto Press, 1986. p. 19
Tradition has it as the image of the Virgin painted by St. Luke himself. The dating is, however, difficult. Its original form is perhaps from the 5th century but its present appearance is the result of later restoration. In Belting, Hans. Likeness and Presence: a history of the image before the era of art. The University of Chicago Press, 1996. pp. 67-78.
