June Carbone, a law professor at the University of Missouri-Kansas City, is co-author of Red Families v. Blue Families: Legal Polarization and the Creation of Culture (2010). She has commented on demographic data involving marriage and families.

Amy Burdette, a sociologist at Florida State University, has conducted research into whether infidelity, marijuana use and other behaviors are more or less common among churchgoers.

The American Association for Marriage and Family Therapy is the professional association for the field of marriage and family therapy. The organization represents the professional interests of more than 50,000 marriage and family therapists throughout the United States, Canada and abroad.

The U.S. Census Bureau provides a summary page on marital status and living arrangements.

Psychology Today offers a summary page on marriage, including articles and blogs by relationship experts. The page also includes links to pages on related topics, including divorce, homosexuality and relationships.

The Marriage & Religion Research Institute archives data about marriage from a number of sources. It also posts links to scholars around the country.

See the Centers for Disease Control and Prevention’s summary page on marriage and divorce.

The Barna Group provides a summary page on family and kids.

ReligiousTolerance.org provides an article on marriage and divorce in Islam.