Bull 1992, pp. 76ff. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.
Bull 1992, p. 81. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.
Beck 1993, p. 188. Beck adds, "the artist left a pictorial record to accompany his written testimony—the famous Portrait of a Lady with an ermine (Czartoryski Collection, Cracow) Beck, James (1993). "The Dream of Leonardo da Vinci". Artibus et Historiae. 14 (27): 185–198. doi:10.2307/1483451. JSTOR1483451.
Bull 1992, p. 78. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.
Bull 1992, pp. 76ff. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.
Bull 1992, p. 81. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.
Beck 1993, p. 188. Beck adds, "the artist left a pictorial record to accompany his written testimony—the famous Portrait of a Lady with an ermine (Czartoryski Collection, Cracow) Beck, James (1993). "The Dream of Leonardo da Vinci". Artibus et Historiae. 14 (27): 185–198. doi:10.2307/1483451. JSTOR1483451.
Bull 1992, p. 78. Bull, David (1992). "Two Portraits by Leonardo: "Ginevra de' Benci" and the "Lady with an Ermine"". Artibus et Historiae. 13 (25): 67–83. doi:10.2307/1483457. JSTOR1483457.