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Lindquist, E. F.Design and Analysis of Experiments in Psychology and Education. Boston: Houghton Mifflin Co., 1953, p. 190–206.
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Ridgway, R.W., Scannell, D.P. Rear-view and traditional projectors for educational films: A comparison. AVCR 10, 137–139 (1962). https://doi.org/10.1007/BF02768588
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DOI: https://doi.org/10.1007/BF02768588