@book{721,
	author = {Marija.J.Norusis},
	title = {SPSS 6.1 guide to data analysis},
	publisher = {Prantice hall Press},
	year = {1987},
	note = {This book shed more light on how readers can use SPSS for windows, its also went ahead in highlighting the process, procedures ,steps used in data collection and analysis .}
}