In her review of the research, Judith Rich Harris suggests that birth order effects may exist within the context of the family of origin, but that they are not enduring aspects of personality.
Raised by his parents William and Ruth Boltz, Boltz is the middle child of his parents' three children (a fourth child died shortly after birth).
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No Two Alike expands on some of the ideas from her previous book The Nurture Assumption, especially the effect of birth order on personality and criticism of developmental psychology.
In his book Born to Rebel, Frank Sulloway provides evidence that birth order influences the development of Big Five personality traits.
The Birth Order Book is a 1982 non-fiction book by Dr. Kevin Leman on birth order and its potential influence on personality and development.
Bearman and Brückner (2008) argue that studies showing a fraternal birth order effect have used nonrepresentative samples and/or indirect reports on siblings’ sexual orientation.