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| | Brownell, W.A. (1945). “When is arithmetic meaningful?”, en ''Journal of educational research'' (Washington, DC), vol. 38, p. 481-98. | | Brownell, W.A. (1945). “When is arithmetic meaningful?”, en ''Journal of educational research'' (Washington, DC), vol. 38, p. 481-98. |
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| − | Brownell, W.A. (1947). “The place of meaning in the teaching of arithmetic”, en Elementary school journal (Chicago, IL), vol. 47, p. 256-65. | + | Brownell, W.A. (1947). “The place of meaning in the teaching of arithmetic”, en ''Elementary school journal'' (Chicago, IL), vol. 47, p. 256-65. |
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| | Carpenter, T.P. et al. (1998). “A longitudinal study of invention and understanding in children’s multidigit addition and subtraction”, en ''Journal for research in mathematics education'' (Reston, VA), vol. 29, p. 3-20. | | Carpenter, T.P. et al. (1998). “A longitudinal study of invention and understanding in children’s multidigit addition and subtraction”, en ''Journal for research in mathematics education'' (Reston, VA), vol. 29, p. 3-20. |