Сметалка: Разлика помеѓу преработките
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Избришана содржина Додадена содржина
Ред 31:
== Библиографија ==
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* {{cite web |last=Fernandes |first=Luis |url=http://www.ee.ryerson.ca/~elf/abacus/history.html |title=The Abacus: A Brief History |year=2013 |work=ee.ryerson.ca |accessdate=July 31, 2014 |archivedate=July 2, 2014 |archiveurl=https://web.archive.org/web/20140702214749/http://www.ee.ryerson.ca/~elf/abacus/history.html |url-status=live
* {{Citation | last = Menninger | first = Karl W. | year = 1969 | title = Number Words and Number Symbols: A Cultural History of Numbers | publisher = MIT Press | isbn = 978-0-262-13040-0}}
* {{Citation | last = Kojima | first = Takashi | year = 1954 | title = The Japanese Abacus: its Use and Theory | publisher = Charles E. Tuttle Co., Inc. | location = Tokyo | isbn=978-0-8048-0278-9}}
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