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الطريقة الحديثة في تعليم الضرب على الآلة الكاتبة
2- Campbell, David, Human Interface Design: Cognitive Friction in the Classroom, 2001.
3- David, P. A., Clio and the Economics of QWERTY, 1985, American Economic Review, 334
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6- Johnston, Stuart J., Path-Dependency Revisited. Information Week, October 27, 1997.
7- Lewin, Peter, The Economics of QWERTY: History, Theory and Policy, Essays by Stan J. Liebowitz and Stephen E. Margolis, Edited with an Introduction and Conclusion by Peter Lewin (New York: New York University Press; and London: Palgrave (formerly Macmillan) 2002).
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