Analysis of information sources in references of the Wikipedia article "Dvorak Simplified Keyboard" in Simple English language version.
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David, Paul A. 1986 (1986). "Understanding the economics of QWERTY: the necessity of history.". In W.N. Parker (ed.). Economic history and the modern economist. New York: Blackwell. ISBN 0-631-14799-3.{{cite book}}: CS1 maint: numeric names: authors list (link)