REFERENCES
Meumann, E.—Vorlesungen zur Einführung in die experimentelle Pädagogik; Engelmann, Leipzig, 1914.
Seashore, C.—Measures of Musical Talent; Columbia Graphophone Company, New York, 1919.
Stern, W.—Die differentielle Psychologie; Barth, Leipzig, 1911.
Thorndike, E. L.—Educational Psychology; 3 vols. Teachers College, Columbia University, 1913.