1. How to build a student for the 21st century;Wallis;TIME Magazine,2006
2. Paul R, Elder L, Bartell T. Taken from the California Teacher Preparation for Instruction in Critical Thinking: Research Findings and Policy Recommendations. State of California, California Commission on Teacher Credentialing, Sacramento, CA, March 1997.
3. The relationship of self-efficacy, motivation, and critical thinking disposition to achievement and attitudes when an illustrated web lecture is used in an online learning environment;Roberts;J Agric Educ,2005
4. Answers.com definition of critical thinking. Available at: http://www.answers.com/topic/critical-thinking [Date accessed: January 1, 2008]