FLETCHER, Catherine. The Black Prince of Florence: The Spectacular Life and Treacherous World of Alessandro de' Medici. Londýn: [s.n.], 2016. Dostupné online. S. 280, 281.
FELL, A. London. Origins of Legislative Sovereignty and the Legislative State: Modern origins,developments, and perspectives against the Background of "Machiavelism".Book I: Pre-Modern "Machiavelism". [s.l.]: Athenäum 432 s. Dostupné online. ISBN9780275939755. (anglicky)