Title: Twins and twin relations
Authors: Koch, Helen L.
Book title: Twins and twin relations
Journal article page numbers: 3-50
Journal article title: Some personality correlates of sex, sibling position, and sex of sibling among five- and six-year old children
Journal name: Genetic Psychology Monographs
Journal volume: 52
Media type: Book
Publisher: Chicago:University of Chicago Press
Year: 1966
Date modified: November 12, 2005
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