So many!
- How Brands Grow;
- Purple Cow;
- Ogilvy on Advertising;
- Reality in Advertising;
- Scientific Advertising.
I know those last ones are advertising focused. But I think the great advertising thinkers are always thinking of building a brand, and those books achieve that.
Check out Contagious by Jonas Berger too, and The Branding Gap.
As a branding consultant - I have a couple of canvases that might help, DM me incase you're interested in the link :)
Suite Books