Billinge, R., Syson, L., & Spring, M. Altered Angels: Two Panels from the Immaculate Conception Altarpiece once in San Francesco Grande, Milan. Leonardo da Vinci : Pupil, Painter and Master.
Chicago-Zitierstil (17. Ausg.)Billinge, Rachel, Luke Syson, 与 Marika Spring. "Altered Angels: Two Panels from the Immaculate Conception Altarpiece Once in San Francesco Grande, Milan." Leonardo Da Vinci : Pupil, Painter and Master .
MLA-Zitierstil (8. Ausg.)Billinge, Rachel, et al. "Altered Angels: Two Panels from the Immaculate Conception Altarpiece Once in San Francesco Grande, Milan." Leonardo Da Vinci : Pupil, Painter and Master, .
警告：这些引文格式不一定是100％准确.