Permissions

1. Modified versions of Chinese abacus image used throughout site in background and logo from Soroban Museum http://www.soroban.com/museum/index_eng.html, Tomoe Fujimoto, tomoe@soroban.com, August 7, 2000. Email message.

References

Electronic Sources
Text or Multimedia from Web Pages, FTP sites, Telnet

1. "ABACUS," Compton Online Encyclopedia. Site no longer available. (May 31, 2000)

2. "Abacus," Microsoft® Encarta® Online Encyclopedia 2000 © 1997-2000 Microsoft Corporation. (June 10, 2000)

3. Fernandes, Luis "The Abacus: Index." Apr 18 2000. (August 8 2000)

Printed Materials
Entire book

1. Zhi, Jun. Zen Yang Xue Zhu Suan. Hong Kong: Shanghai Book Co, LTD., 1992.