1. Allen, W. S. A Study of Latin Prognosis, Contributions to Education, No. 135 (New York: Teachers College, Columbia University, 1922), 41 pp.
2. Boe, O. G. The Relation Between Size of High School Attended and Scholastic Success in College, Unpublished Master’s Thesis. University of Chicago, 1930.
3. Brock, Earl E. Prediction of Success of College Students in Latin, Spanish, and French, Unpublished Master’s Thesis, University of Colorado, 1935.