Bibliography:Abacus
From Knowino
Revision as of 14:21, 6 December 2010 by Boris Tsirelson (talk | contributions)
- Takashi Kojima, The Japanese Abacus: its Use and Theory ISBN 0-8048-0278-5
- Takashi Kojima, Advanced Abacus: Japanese Theory and Practice ISBN 0-8048-0003-0