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Scripture, Edward W. and C.S. Lyman. 1892-1893. Drawing a straight line; a study in experimental didactics. Studies from the Yale Psychological Laboratory 1: 92-96
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Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar