I’ve been teaching critical thinking for many years, and I’ve developed a short, free, Creative Commons-licensed text that’s useful for a brief (maybe 3 week?) critical thinking section in any intro philosophy or composition course (or really, just about any course; it’s been used at my college by professors from a number of departments.)
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This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.
DiGiovanna, James, "Critical thinking: Primary concepts" (2013). CUNY Academic Works.