11.12 Birth order
Sundet, J. M., Eriksen, W., Borren, I. & Tambs, K. (2010).  The Flynn effect in sibships: Investigating the role of age differences between siblings.  Intelligence, 38, 38–44.
Zajonc, R. B., & Mullally, P. R. (1997). Birth order:  Reconciling conflicting effects. American Psychologist, 52(7), 685-699.
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