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N. E. Berthier , S. De Blois , C. R. Poirier , M. A. Novak & R. K. Clifton (2000) Where's the ball? Two- and three-year-olds reason about unseen events. Developmental Psychology 36(3):394–401.
S. Carey (2009) The origin of concepts. Oxford University Press.
G. Goldenberg & S. Hagmann (1998) Tool use and mechanical problem solving in apraxia. Neuropsychologia 36:581–89.
S. H. Johnson-Frey (2004) The neural bases of complex tool use in humans. Trends in Cognitive Sciences 8(2):71–8.
J. J. Lockman (2000) A perception-action perspective on tool use development. Child Development 71(1):137–44.
R. Saxe & S. Carey (2006) The perception of causality in infancy. Acta Psychologica 123:144–65.