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- [5] Contributions to Psychology of Form, vol 1 ARCHIV FUR DIE GESAMTE PSYCHOLOGIE, 1924, 48 (1-2): : 182 - 187
- [6] Contributions to Education, vol 2, pt 1, Experiments in the Classroom, pt 2, Problems in Teacher Training JOURNAL OF EDUCATIONAL RESEARCH, 1929, 19 (03): : 208 - 209