I'm not sure that all those people on Stackexchange have read the question properly. The question is "What is the single most influential book every programmer should read?" I.e. given the set of books that every programmer should read, which one is the single most influential? As a programmer, lets consider the answer to the question, as parsed logically (regardless of intent). Typing 'most influential books' into G…
If we're assuming an America-centric question and your abstract definition then you can summarize it with just one book: 1. The Bible. Closely followed by whatever the first book that people in stackoverflow's demographic read whilst learning to read.
I'm an atheist, but even I can see the bible's profound impact on the course of western and near-eastern civilisation.