Bibliography
- Bedwell, Margaret. Comprehension of Concepts of Quantity in Third Grade Social Studies Reading Material, Master’s Thesis, University of Iowa, Iowa City, 1932.
- Cummings, Mable E. Comprehension as Affected by the Use of Quantitative Terms in Social Science Textbooks, Master’s Thesis, University of Iowa, Iowa City, 1933.
- Lindquist, E. F. Statistical Analysis in Educational Research, Houghton Mifflin Company, Boston, 1940.
- Ryan, Grace M. A Study of the Comprehension of Quantitative Terms in Geography at the Fifth Grade Level, Master’s Thesis, University of Iowa, Iowa City, 1935.