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Referenced multiple times throughout the episode as a source for stories about Harun al-Rashid and Baghdad. The hosts read a passage from it at the beginning and discuss how it shaped perceptions of Baghdad as a mythical city.

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Described as having written 'a wonderful book about Harun al-Rashid' - referenced when discussing population estimates for Baghdad, suggesting it may have reached a million inhabitants.

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Explicitly described as 'a wonderful book that was written in 1900' - cited for its description of how the round city of Mansur related to greater Baghdad, comparing it to the City of London's relationship to greater London.