1. Astington, J. W., Harris, P. L., & Olson, D. R. (Eds.). (1988). Developing theories of mind. New York: Cambridge University Press.
2. Atkinson, M. (1979). Prerequisites for reference. In E. Ochs & B. B. Schieffelin (Eds.), Developmental pragmatics (pp. 215–247). New York: Academic Press.
3. Bakeman, R., Adamson, L. B., Konner, M., & Barr, R. G. (1990). Kung infancy: The social context of object exploration. Child Development, 61, 794–809.
4. Bates, E. (1979). Intentions, conventions and symbols. In E. Bates, L. Benigni, I. Bretherton, L. Camaioni, & V. Volterra (Eds.), The emergence of symbols (pp. 33–42). New York: Academic Press.
5. Bates, E., Benigni, L., Bretherton, I., Camoioni, L., & Volterra, V. (1979). Cognition and communication from 9–13 months: Correlational findings. In E. Bates, L. Benigni, I. Bretherton, L. Camaioni, & V. Volterra (Eds.), The emergence of symbols (pp. 69–140). New York: Academic Press.