Mental abacus (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Mental abacus" in English language version.

refsWebsite

Global rank English rank

low place

low place

1theguardian.com

12^th place

11^th place

1web.archive.org

1^st place

1^st place

309^th place

660^th place

5^th place

5^th place

shuzan.jp

"Research on the benefits of mental abacus for development". Retrieved March 12, 2012.

theguardian.com

Alex Bellos (2012), "World's fastest number game wows spectators and scientists", The Guardian

web.archive.org

"(Chinese)Teaching Kids Visit to use abacus for mental calculation". Archived from the original on February 13, 2017. Retrieved March 12, 2012.

worldcat.org

search.worldcat.org

Feynman, Richard (1985). "Lucky Numbers". Surely you're joking, Mr. Feynman!. New York: W.W. Norton. ISBN 0-393-31604-1. OCLC 10925248.

xinhuanet.com

sh.xinhuanet.com

"(Chinese)Teaching Kids Visit to use abacus for mental calculation". Archived from the original on February 13, 2017. Retrieved March 12, 2012.