Abacus (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Abacus" in Simple English language version.

refsWebsite

Global rank Simple English rank

5^th place

worldcat.org

Boyer, Carl B. (1991). A history of mathematics. Uta C. Merzbach (2nd ed. [rev.] ed.). New York: Wiley. ISBN 0-471-54397-7. OCLC 23823042.
Instruments of science : an historical encyclopedia. New York: Science Museum, London, and National Museum of American History, Smithsonian Institution, in association with Garland Pub. 1998. ISBN 0-8153-1561-9. OCLC 36817134.