Παραπομπή σε μορφή APA (7η εκδ.)

Ladis, A. (2009). Giotto's O: Narrative, figuration, and pictorial ingenuity in the Arena Chapel. Pennsylvania State University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ladis, Andrew. Giotto's O: Narrative, Figuration, and Pictorial Ingenuity in the Arena Chapel. University Park, Pa: Pennsylvania State University Press, 2009.

Παραπομπή σε μορφή MLA (8th εκδ.)

Ladis, Andrew. Giotto's O: Narrative, Figuration, and Pictorial Ingenuity in the Arena Chapel. Pennsylvania State University Press, 2009.