Kenneth R. Beittel, Edward L. Mattil, Herbert J. Burgart, Robert C. Burkhart, Clarence Kincaid, Robert Stewart, The Effect of a "Depth" vs. a "Breadth" Method of Art Instruction at the Ninth Grade Level, Studies in Art Education, Vol. 3, No. 1 (Autumn, 1961), pp. 75-87
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Beittel et al. (1961) studied this question.
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