[64] Survey conducted by L. P. Ayres of the Russell Sage Foundation. “The Public Schools of Springfield, Illinois,” pp. 86-88. Published by the Springfield Survey Committee, Springfield, Illinois, 1914.
[65] W. C. Bagley, “The Determination of Minimum Essentials in Elementary Geography and History.” Fourteenth Yearbook of the National Society for the Study of Education, Part I, pp. 131, 134-135. The University of Chicago Press, 1915.
[66] W. W. Charters and Edith Miller, “A Course of Study in Grammar,” pp. 43-45. Bulletin No. 2, University of Missouri, Vol. XVI (1915).
[67] A. Lawrence Lowell, “College Studies and Professional Training.” Educational Review, Vol. XLII (October, 1911), pp. 220, 221, 233.
[68] W. A. Jessup and L. D. Coffman. The Macmillan Company, 1916.
[69] J. M. Rice, editor of the Forum.
[70] Leonard P. Ayres, “Making Education Definite.” Bulletin No. 11, Indiana University, Vol. XIII (October, 1915), pp. 85-86. Published by the Extension Division of Indiana University.
[71] E. L. Thorndike, “Handwriting.” Teachers College Record, March, 1910.
[72] L. P. Ayres, A Scale for Measuring the Quality of Handwriting of School Children. Russell Sage Foundation, New York.
[73] F. N. Freeman, The Teaching of Handwriting. Houghton Mifflin Company, 1914.