1. Brigham , Herbert P. “Comparison of Performances of Eighth and Tenth Year Students with Concepts of General Biology” 1962
2. “Some Data Pertinent to Textbooks of General Science”;Graham;Science Education,January 1941
3. “The Content of Junior High School Science”;Pettit;School Science and Mathematics,October 1940
4. Schwirian , Patricia M. “A Survey of Seventh Grade Science Teaching in Iowa” Master's Thesis State University of Iowa 1962
5. Schwirian , Patricia M. “Identification of Basic Concepts of Chemistry Appropriate for Grade Seven” 1962