Here are several helpful resources for researching the topic of birth order:
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Need a book or journal article that the Library don't seem to have? Take advantage of the Library's free interlibrary loan (ILL) service. We will locate a copy of the item for you. Many ILL items can be obtained within 2 weeks- some within a few days, if its an electronic copy.
Birth Order: what your position in the family really tells you about your character by 
Birth Order Blues: how parents can help their children meet the challenges of birth order by 
The Birth Order Book:why you are the way you are by 
Born to Rebel: birth order, family dynamics, and creative lives by 
International Encyclopedia of Marriage and Family
Salem Health