A Study of the Effects of Modern Music on Operant Aggression in Delinquent and Non-Delinquent Adolescents, thesis, August 1966; (https://digital.library.unt.edu/ark:/67531/metadc130754/m1/8/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .