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A. J. Baroody (1995) The role of the number-after rule in the invention of computational shortcuts. Cognition and Instruction 13:189–219.
P. L. Harris & M. A. Koenig (2006) Trust in testimony: How children learn about science and religion. Child Development 77:505–24.
R. S. Siegler & M. Robinson (1982) The development of numerical understandings. In: Advances in child development and behaviour, vol. 16, ed. H. W. Reese & L. P. Lipsitt , pp. 241–312. Academic Press.