Yep, as they said, How To Brew is the standard.
IMO another important one is The Complete Joy of Homebrewing by Charlie Papazian.
HTB is more scientific; more about numbers and why something is happening, CJoH is more of a feel vibe. Papzian's mantra is, "relax, don't worry, have a homebrew." and that is a good theory to have. Unless you completely mess up, it's very hard not to end up with beer. It may not be an award winning one, but it will be beer.