Found in 2 comments on Hacker News
decebalus1 · 2019-06-14 · Original thread
This book https://www.amazon.com/Aisles-Have-Eyes-Retailers-Shopping/d... goes into quite a bit of detail about various techniques retailers use to track customers.
JosephLark · 2017-05-24 · Original thread
Not Google specific, but some good reading on this topic came out in January - The Aisles Have Eyes: How Retailers Track Your Shopping, Strip Your Privacy, and Define Your Power [0]

[0] https://www.amazon.com/Aisles-Have-Eyes-Retailers-Shopping/d...

Fresh book recommendations delivered straight to your inbox every Thursday.