The study found that happy people are more likely to be socially active, read,vote and attend religious services.

VOA: special.2009.03.10

The Pew Forum on Religion and Public Life did a study in two thousand seven on major religious traditions in the United States.

VOA: special.2010.03.05

Other traits considered in the study were loneliness, and religious and political beliefs.

VOA: special.2009.11.24