1. Artley, A. Sterl A Study of Certain Relationships Existing Between General Reading Comprehension and Reading Comprehension in Specific Subject Matter Areas. Doctor’s Dissertation. State College, Pennsylvania: The State College of Pennsylvania, 1942.
2. Bedell, Ralph Clarion. The Relationship Between the Ability to Recall and the Ability to Infer in Specific Learning Situations. Unpublished Doctor’s Dissertation. Kirksville, Missouri. University of Missouri, 1934.
3. Bedwell, Margaret. Comprehension of Concepts of Quantity in Third Grade Social Studies Reading Materials. Unpublished Master’s Thesis. Iowa City, Iowa: University of Iowa, 1932.