1. Anderman, L. H. and Midgely, C. 1998. Champaign, IL: ERIC Clearinghouse on Elementary and Early Childhood Education. ERIC. Motivation and middle school students. ED 421 281
2. The Seven Steps to Critical Thinking: A Practical Application Of Critical Thinking Skills
3. Houghton, R. S. 2003. Comparing thinking skills model—Adapted from Marzano. Available at:www.ceap.wcu.edu/HOUGHTON/Learner/Think94/NCmarzanoThink.html