Ellis, J. L., & Blank, S. S. (1985). Creative problem solving in every classroom. Department of Educational Psychology and Special Education.
Chicago-viite (17. p.)Ellis, Julie L., ja Stanley S. Blank. Creative Problem Solving in Every Classroom. British Columbia, CAN: Department of Educational Psychology and Special Education, 1985.
MLA-viite (9. p.)Ellis, Julie L., ja Stanley S. Blank. Creative Problem Solving in Every Classroom. Department of Educational Psychology and Special Education, 1985.
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