Essentials
How we know what isn't so, by T. Gilovich
I'd also recommend these two sort of specialized books but great nonetheless on critical thinking:
How to think about weird things, by Schick and Vaughn
and
Mistakes were made, (but not by me), by Tavris & Aronson
These are general reading but have been used as textbooks as well. I think that's better than a text, actually.