Preschool Oppositional Defiant Disorder: A Disorder of Negative Affect, Surgency, and Disagreeableness. Journal Of Clinical Child And Adolescent Psychology : The Official Journal For The Society Of Clinical Child And Adolescent Psychology, American Psychological Association, Division 53, 47(6), 967-977. https://doi.org/10.1080/15374416.2016.1225504 (Original work published 1969)
. (1969).