Chio, S. T. (1980). Difficulties in problem solving in mathematics among grade six pupils.
Citazione stile Chigago Style (17a edizione)Chio, Singlee Tan. Difficulties in Problem Solving in Mathematics Among Grade Six Pupils. 1980.
Citatione MLA (9a ed.)Chio, Singlee Tan. Difficulties in Problem Solving in Mathematics Among Grade Six Pupils. 1980.
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