References

"The Story of Weights and Measures." Ganeri, Anita. Oxford University Press: New York, 1996. ISBN 0-19-521328-9

"Best of Wonder Science." Delmar Publishers, Albany, 1997. ISBN 0-8273-8094-1 "Science for Children: A Book for Teachers." Willard J. Jacobson   and Abbey Barry Bergman, Prentice Hall: Englewood Cliffs.

WOW Staff, 2002.