Is e staitistearachd meur matamataig gnìomhaichte mu thimcheall dòighean air fiosrachadh fhaighinn à dàta deuchainneach. GeorgeE. P. Box Ronald Fisher...
Lassiter, Luther; Sullivan, George (1965). Billiards for Everyone. New York: Grosset & Dunlap. p. 35. Stooke, Michael P. (March 14, 2010). "Definitions