Publication manual of the American Psychological AssociationSocioloist often use two different style. First they may use the American Sociology Association (ASA). Second, they may use APA. The links and books listed will help you. Check with your professor to determine which one you should use.
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The Blackwell Dictionary of Sociology
Cambridge Encyclopedia of Child Development
The age of independence : interracial unions, same-sex unions, and the changing American family by 
The marriage-go-round : the state of marriage and the family in America today by 
Single by chance, mothers by choice by Statistics are considered primary sources. These are the raw numbers you can use to help see trends and corrolations. Polls only survey opinions of people. They are not as credible as statistics, but they can help your research.
