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Described as 'the great historian of Protestantism' and quoted multiple times about Luther's theology and his 'raw Trumpian brilliance at German language polemic.' The quotes suggest these come from Ryrie's written work on the Reformation/Protestantism.

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Explicitly mentioned as 'Richard Rex in his book' when discussing when Luther's Reformation moment occurred, arguing it happened early in 1518.

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Referenced as 'Scott Hendricks, I think, in his book on Luther' when discussing Luther's statement that 'many of Hus's beliefs were completely Christian.'

Context:

Mentioned as 'Linda Roper says' (likely Lyndal Roper, the Luther biographer) when discussing Eck's victory in the Leipzig debate, noting that 'it ultimately doesn't matter, because it was not interesting.'