| Leslie Steffe - Vol. 2 Num. 1 (1982) | ||
| On the nature of counting activity: perceptual unit items | 13-21 | |
for the learning of mathematics
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Search Table of Contents
| Leslie Steffe - Vol. 2 Num. 1 (1982) | ||
| On the nature of counting activity: perceptual unit items | 13-21 | |