@book{479710,
	author = {Salkind, Neil J. and Sage eBooks},
	title = {Encyclopedia of measurement and statistics},
	publisher = {SAGE,},
	year = {2006.},
	address = {Thousand Oaks, Calif. ;},
	url = {http://methods.sagepub.com/reference/encyclopedia-of-measurement-and-statistics}
}