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Referenced as the novels that preceded the TV series, discussing how dragons in the story start as eggs and hatch at the end of the first series

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Explicitly mentioned as a book where Sagan proposes that the universality of dragon myths is a legacy of human ancestry in Mesozoic ecosystems

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Referenced as 'a brilliant series of books by a scholar called Adrian Mayer' about the theory that discovery of dragon fossils might have inspired dragon myths

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Discussed extensively as the source of the dragon Smaug, noting Tolkien began writing it in the early 1920s and how it draws on Norse and Old English traditions

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Referenced as the Old English poem featuring one of the two significant dragons in northern literature, where an aged Beowulf fights and kills a dragon but dies from his wounds

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Explicitly described as 'a wonderful book by a scholar called Daniel Ogden' that examines what characterizes a drachone in Greek mythology

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Referenced as part of the Narnia stories where the character Eustace turns into a dragon as punishment for his behavior

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Referenced as Mallory writing about King Arthur and dragons, mentioned in the context of how printing cemented certain images of dragons in the 15th century