Robert Plomin, Jerome Kagan, Robert N. Emde, J. Steven Reznick, Julia M. Braungart, JoAnn Robinson, Joseph Campos, Carolyn Zahn-Waxler, Robin Corley, David W. Fulker, J. C. DeFries, Genetic Change and Continuity from Fourteen to Twenty Months: The MacArthur Longitudinal Twin Study, Child Development, Vol. 64, No. 5 (Oct., 1993), pp. 1354-1376
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