@book{211943,
	author = {Mood, Alexander McFarlane, and Graybill, Franklin A.},
	title = {Introduction to the theory of statistics /},
	publisher = {McGraw-Hill,},
	year = {1963.},
	series = {McGraw-Hill series in probability and statistics},
	address = {New York :},
	edition = {2nd ed.}
}