Page, R., Clarke, R., & Poole, J. (1982). Problem solving. Oliver & Boyd in association with the National Centre for School Technology.
Chicago-viite (17. p.)Page, Ray, Roland Clarke, ja John Poole. Problem Solving. Edinburgh: Oliver & Boyd in association with the National Centre for School Technology, 1982.
MLA-viite (8. p.)Page, Ray, et al. Problem Solving. Oliver & Boyd in association with the National Centre for School Technology, 1982.
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