Action Research 23
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Slavin, R.E. (2003). Educational psychology: Theory and practice (7th Ed.). Boston: Allyn and Bacon.
Stevenson, E.N. (1940). Questionnaire results on the value and extent of the field trip in general biology. (7) 380-382.
Tobias, S. (1990). They're not dumb, they're different: Stalking the second tier. Tucson: Research Corporation, 1990.
Wilson, B. G. (Ed.). (1996). Constructivist learning environments: Case studies in instructional design. Englewood Cliffs: Educational Technology Publications.