Sfard, A (1998). "On two metaphors for learning and the dangers of choosing just one". Educational Researcher. 27 (2): 4–13. doi:10.3102/0013189x027002004. S2CID135448246.
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Sfard, A (1998). "On two metaphors for learning and the dangers of choosing just one". Educational Researcher. 27 (2): 4–13. doi:10.3102/0013189x027002004. S2CID135448246.