Relevant notes and citations provided to TED by Alison Gopnik.
Betty M. Repacholi and Alison Gopnik, "Early reasoning about desires: Evidence from 14- and 18-month-olds," Developmental Psychology, 1997
Daphna Buchsbaum et al., "The power of possibility: Causal learning, counterfactual reasoning, and pretend play," Philosophical Transactions of the Royal Society, 2012
Alison Gopnik, "Scientific thinking in young children: Theoretical advances, empirical research, and policy implications," Science, September 28, 2012
Alison Gopnik, The Philosophical Baby, Picador, 2010
See Chapter 4.