The Apparent Relationship between Classroom Behavior Problems and the Emotional Stability of Twenty-Five Second Grade Children in the Sam Houston Elementary School, Denton, Texas, thesis, 1949; (https://digital.library.unt.edu/ark:/67531/metadc83527/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .