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Referenced multiple times throughout the episode. First mentioned as someone 'who love[s] Napoleon,' then cited directly regarding Josephine's possible PTSD ('Andrew Roberts says he thinks she was suffering... post-traumatic stress disorder'), and again when discussing intimate details ('Andrew Roberts discusses, says he doesn't know what it is, which is called the zigzags'). These references are to Roberts' Napoleon biography.

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Explicitly referenced as 'Andrew Roberts in his biography' when discussing the detail about Napoleon noting Saint Helena in his school exercise book. This is Roberts' Napoleon biography.

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Referenced as 'his biography of George III, which came out about, what, a year ago, two years ago' when discussing the point that had George III actually been a tyrant, he would have won the war.

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Referenced multiple times as 'Andrew Roberts' biography' - described as the most recent biography of Churchill, discussing the theme of Churchill's sense of destiny

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A biography of George III mentioned as 'Andrew Roberts' biography that came out last year' - discussed in relation to theories about George III's madness, specifically rejecting the porphyria thesis

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Described as a novel published in the mid-1990s with a Germanic gothic script title, about 'a plot for a fourth Reich or something like that.' Mentioned in the context of discussing comparisons between the EU and Nazi Germany made by some Brexiteers.