%0 Book Section %B Language acquisition and conceptual development %D 2001 %T Person in singletons, siblings, and twins %A Deutsch, Werner %A Wagner, A. %A Burchardt, R. %A Schultz, N. %A Nakath, J. %E Bowerman, M. %E Levinson, S. C. %B Language acquisition and conceptual development %I Cambridge University Press %C Cambridge %P 284–315 %G eng