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Butler, FrankA. The Improvement ofTeaching in Secondary Schools. Chicago: University of Chicago Press, 1946, pp. 251-85.
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Dodds, B.L.That All May Learn, BULLETIN No. 85. Washington, D. C.: National Association of Secondary-School Principals, 1939.
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Douglass, Harl R., and Mills, Hubert H.Teaching in High School. New York: The Ronald Press, 1948 , pp. 380-410.
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Krug, Edward, and Anderson, G. Lester, editors. Adapting Instruction in the Social Studies to Individual Differences, Fifteenth Yearbook. Washington, D. C.: National Council of the Social Studies, 1944.
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Mursell, JamesL. Successful Teaching: Its Psychological Principles. New York: McGraw-Hill Book Co., 1946, pp. 189-226.