Brown, David Alan (1983). »Raphael's "Small Cowper Madonna" and "Madonna of the Meadow": Their Technique and Leonardo Sources«. Artibus et Historiae. 4 (8): 9–26. doi:10.2307/1483213. JSTOR1483213.
Brown, David Alan (1983). »Raphael's "Small Cowper Madonna" and "Madonna of the Meadow": Their Technique and Leonardo Sources«. Artibus et Historiae. 4 (8): 9–26. doi:10.2307/1483213. JSTOR1483213.