Gershoff, Elizabeth T., Gail S. Goodman, Cindy L. Miller-Perrin, George W. Holden, Yo Jackson, and Alan E. Kazdin. 2018. “The Strength of the Causal Evidence Against Physical Punishment of Children and Its Implications for Parents, Psychologists, and Policymakers”. American Psychologist 73 (5): 626 – 638.