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Explicitly described as 'a brilliant book on the Medici by Christopher Hibbert, a great popular historian of the 60s and 70s' - referenced for information about Medici Florence's government and later for a description of Duke Filippo Maria Visconti

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Described as 'a great book and actually quite a caustic book about the Medici by Mary Hollingsworth' - referenced for information about Cosimo's library inventory and the backgrounds of Medici-aligned families

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Referenced as 'a historian' and later 'Donald Weinstein, on his book on this period' - quoted describing what Florence would have been like and Cosimo's image as a benevolent father figure

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Referenced as 'Giorgio Vasari in his Lives of the Great Artist' when discussing the painter Filippo Lippi's behavior and how Cosimo had to lock him in his room

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Referenced when discussing Cosimo's concerns about usury and the afterlife - 'he is undoubtedly familiar with something like Dante's Divine Comedy' where usurers are depicted in hell