| earlham.edu | Real-World Reasoning |
| soyouwanna.com | So You Want to Avoid Common Logical Errors? |
| thinkingworld.com | Creating A Thinking World |
| rosebrooke.com | The Rosebrooke Company |
| phact.org | Philadelphia Association for Critical Thinking |
| limbicnutrition.com | Thinking Straight: Internet Resources |
| csj.org | Critical Thinking Study Topics |
| csicop.org | A Field Guide to Critical Thinking (Skeptical Inquirer Winter 1990) |
| criticalthinking.com | The Critical Thinking Co.™ - Better Grades and Higher Test Scores |
| critical-thinking-lab.com | Critical Thinking Lab |
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