@book{77949,
	author = {Cooper, Donald R and Schindler, Pamela S},
	title = {Business research methods. (6th ed.)},
	publisher = {Tata McGraw-Hill},
	year = {1999},
	series = {The Irwin/McGraw-Hill series, operations and decision sciences},
	address = {New Delhi:},
	edition = {6th ed.}
}