Autor:	HARTWELL, E. C., COOPER, WILLIAM JOHN, GOSLING, THOMAS W., JUDD, CHARLES H., BUCKINGHAM, B. R., THRELKELD, A. L., FRANK, GLENN, ENGELHARDT, N. L., FREEMAN, FRANK N., COFFMAN, LOTUS D., DEWEY, JOHN, STETSON, PAUL C., CLEM, ORLIE M., BAGLEY, WILLIAM C., TOWNE, CHARLES F., LEE, CHARLES A., MILLER, CLYDE R.
Zdroj:	The Journal of Education, 1933 Mar . 116(6), 147-150.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/42848990 Zobrazit plný text záznamu