MLA

Snyder, Leslie B, and Mark A Hamilton. A Meta-analysis of U.s. Health Campaign Effects On Behavior: Emphasize Enforcement, Exposure, and New Information and Beware the Secular Trend. USA, 2002.

APA

Snyder, L. B, & Hamilton, M. A. (2002). A meta-analysis of U.S. health campaign effects on behavior: emphasize enforcement, exposure, and new information and beware the secular trend. USA.

Chicago

Snyder, Leslie B., and Mark A Hamilton. A Meta-Analysis of U.S. Health Campaign Effects On Behavior: Emphasize Enforcement, Exposure, and New Information and Beware the Secular Trend. USA, 2002.