1. Baldwin DA, Moses LJ (1996) The ontogeny of social information gathering. Child Dev 67:1915–1939
2. Bard K (1991) Distribution of attachment classifications in nursery chimpanzees. Am J Primatol 24:88
3. Bates E, Camaioni L, Volterra V (1975) The acquisition of performatives prior to speech. Merrill Palmer Q 21:205–224
4. Call J, Tomasello M (1996) The effect of human on the cognitive development of apes. In: Russon AE, Bard KA, Parker ST (eds) Reaching into thought: the minds of the great apes. Cambridge University Press, Cambridge, pp 371–402
5. Call J, Braüer J, Kaminski J, Tomasello M (2003) Domestic dogs (Canis familiaris) are sensitive to the attentional state of humans. J Comp Psychol 117:257–263