@book{1135,
	author = {LIND, D.A. and MARCHAL, W.G. &  WATHEN, S.A.},
	title = {Statistics Technical in Business & Economics.},
	publisher = {Mcgraw- Hill  Irwin,},
	year = {2008.},
	address = {New York,},
	edition = {13th Ed.}
}