A Study of Two Methods of Teaching the Visual Element Value as Seen in the Creative Works of Children in the Fourth, Fifth, and Sixth Grades, thesis, August 1967; (https://digital.library.unt.edu/ark:/67531/metadc163909/m1/69/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .