Scores and readings:

Ausubel, D. 1968. Educational Psychology, A Cognitive View. New York: Holl, Rinehart and Winston Inc.

Barret, M. 1991. Attachment Behavior and the Schoolchild. London, Tavistock.

Barron, B. 1991. Collaborative Problem Solving. Vanderbilt University.

Colby, A. 1994. The Measurement of Moral Judgement: Volume 2. Cambridge, University Press.

Gutierrez, A. 2001. Coding the nature of thinking displayed in responses on nets of solid, Hiroshima, Japan

Maslow, A. 1954. Motivations and Personality. New York: Harper & Row

Piaget, J. 1932. The Moral Judgement of the Child. London, Routledge & Kegan.

Vygotsky, L. 1986. Thought and Language. Cambridge, MIT Press.

Yli-Luoma, P. 1992. Predictors of Critical Thinking Abilities. A Rasch Model Approach. University of Helsinki