Reference

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Darling-Hammond, L., Barron, B., Pearson, P.D., Shoenfiled, A.H., Stage, E.K., Zimmerman, T.D., Tilson, J.L. (2008). Powerful learning: What we knowl about teaching for understanding. San Franscisco. CA: Jossey-Bass.

Hunter, D.C. (2009). //A Practical Guide to Critical Thinking//. Hoboken, New Jersey: John Wiley & Sons, Inc..

Snyder, L. G., & Snyder, M. J. (2008). Teaching critical thinking and problem solving skills. //Delta Pi Epsilon Journal,// 50(2), 96.