Critical thinking is a way of deciding whether a claim is always true, sometimes true, partly true, or false. It can be traced in the West to ancient Greece with its Socratic method and in the East to ancient India with the Buddhist kalama sutta and abhidharma literature.

A taxonomy of critical thinking dispositions and abilities
Collaborative Learning Enhances Critical Thinking
Critical thinking, cognitive presence, and computer conferencing in distance education
Critical Thinking : What Every Person Needs to Survive in a Rapidly Changing World / R.W. Paul.
Computers in the classroom: mindtools for critical thinking
Thought & knowledge: An introduction to critical thinking (4th ed.).
Critical Thinking: A Statement of Expert Consensus for Purposes of Educational Assessment and Instruction. Research Findings and Rec...
Developing reflective judgment : understanding and promoting intellectual growth and critical thinking in adolescents and adults
A review of Developing Reflective Judgment: Understanding and Promoting Intellectual Growth and Critical Thinking in Adolescents and...
Developing Reflective Judgment: Understanding and Promoting Intellectual Growth and Critical Thinking in Adolescents and Adults. Jos...