A Study of the Elementary Science Programs in Leading Schools of Texas and Other Southern States as Compared with the Course of Study from the Thirty-First Yearbook of the National Society for the Study of Education, thesis, 1945; (https://digital.library.unt.edu/ark:/67531/metadc75405/m1/1/: accessed June 25, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .