1. Adelman, Marie. Difficulty of Four Original and Simplified Novels, as Judged by the Lewerenz, Winnetka, and Lorge Formulae. Master's Thesis. New York: School of Education, the College of the City of New York, 1941.
2. Bear, Mata Virginia. The Length of Words as an Index of Difficulty in Silent Reading. Master's Thesis. Chicago: Department of Education, University of Chicago, 1927.
3. Leading and legibility.