Bailey, U. ., Lorch, E. ., Milich, R. ., & Charnigo, R. . (1969). Developmental changes in attention and comprehension among children with attention deficit hyperactivity disorder. Child Development, 80(6), 1842-55. https://doi.org/10.1111/j.1467-8624.2009.01371.x (Original work published 1969)