@book{76125,
	author = {Phelps, Dudley Maynard. and Duncan, Delbert J.},
	title = {Marketing management : principles and methods /},
	publisher = {R.D. Irwin,},
	year = {1960 [1961]},
	address = {Homewood, Ill.,},
	edition = {Fourth Edition},
	note = {First ed. published in 1951 under title: Sales management: policies and procedures.}
}