@book{75515,
	author = {Koontz, Harold, and O'Donnell, Cyril,},
	title = {Principles of management:},
	publisher = {McGraw-Hill ,},
	year = {1972},
	series = {McGraw-Hill series in management},
	address = {New York :},
	edition = {5th ed.},
	note = {Sixth ed. published under title: Management: a systems and contingency analysis of managerial functions.}
}