This is merely a short leaflet on the subject, but it is condensed accurately, and the subject is SO important for everyone these days, with the huge amount of misleading information online, that I was honestly thinking of getting my entire family a copy each for xmas this year.
Critical Thinking is one of THE best and most useful things to come out of a degree education. If you have graduated without a good critical thinking ability, you may well have wasted your time studying.
This is a tiny overview of the subject, but I honestly think anyone over the age of 18 should have read it, and hopefully, understood it enough to put it into practice in their life.