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k r2.6.4) (bot Menambah: bn:টাইপ রাইটার |
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== Referensi ==
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* David, P.A. 1986. ''Understanding the Economics of QWERTY: The Necessity of History''. In: Parker, William N.: Economic History and the Modern Economist. Basil Blackwell, New York and Oxford.
* Thompson, Holland. ''The Age of Invention: A Chronicle of Mechanical Conquest''. 2009. BiblioBazaar, LCC.
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