We touch on C.S. Lewis' "On Stories," which Pullman cites approvingly more than once: https://gutenberg.ca/ebooks/lewiscs-onstories/lewiscs-onstories-00-h.html 
Here's some information about the wall Gabriel mentioned, dividing rich and poor parts of Oxford: http://www.bbc.co.uk/oxford/content/articles/2009/03/26/cutteslowe_feature.shtml
It's very close to the Hornbeam trees (Sunderland Avenue: https://www.geograph.org.uk/photo/2368292)
This is the cemetery described by Pullman in The Subtle Knife: https://en.wikipedia.org/wiki/Wolvercote_Cemetery
This is Gabriel's flash fiction piece, chosen as one of five competition winners by Philip Pullman: https://gabrielschenk.com/writing/home/
More information on the Jewish cemetery and the Botanical Gardens: https://www.oxfordjewishheritage.co.uk/projects/botanic-gardens-first-jewish-cemetery 
More images from the books and the "How to Read the Alethiometer" promotional poster can be found on the HDM Fandom. 

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