Seriously? No one has mentioned K&R. It's arguably the best programming book ever written.
Well that is debatable and many people might not agree with you (though I tend agree and put it near, if not at the top of my own list).
As they say, De gustibus non est disputandum:
https://en.wikipedia.org/wiki/De_gustibus_non_est_disputandu...
Along with K&P, makes for two of the best, and where Kernighan was a co-author, IMHO.
Of course, caveats apply and should be mentioned (a few others have said it), such as it not being up to date with latest versions of the C standard. But that does not diminish the achievements or quality of K&R.
Edits for grammar / wording.
[1] And some people, even on here, may be surprised at how much some people are lacking in that sort of knowledge, more so in these days of Android and Apple tablets and smartphones, where a lot of the underlying details of computers (both on hardware and software) are abstracted away. Very different from the age of hobbyist home computers, where you had to know a good amount about the internals to use the things, as some many comments in recent threads here about them have mentioned.