Title: Twins and twin relations
Authors: Koch, Helen L.
Book Title: Twins and twin relations
Date Modified: 11/12/2005
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
Year Start: 1966
Year End: 1966