[57.] Thorndike, E.L. The Elimination of Pupils from School, U.S. Bureau of Education Bulletin, No. 4, 1907, p. 10.
[58.] Farrington, F.E. French Secondary Schools, p. 124.
[59.] Inglis, A. Principles of Secondary Education, p. 669.
[60.] Committee of N.E.A. Vocational Secondary Education, U.S. Bureau of Education Bulletin No. 21, 1916, p. 58.
[61.] Breslich, E.R. Supervised Study as Supplementary Instruction, Thirteenth Yearbook, p. 43.
[62.] Minnick, J.H. "The Supervised Study of Mathematics," School Review, 21-670.
[63.] Wiener, W. "Home Study Reform," School Review, 20-526.
[64.] Colvin, S.S. An Introduction to High School Teaching, p. 366.
[65.] Brown, J.S. School and Home Education, February, 1915, p. 207.
[66.] Reavis, W.C. "Supervised Study," in Parker's Methods of Teaching in the High School, p. 398.