@book{122103,
	author = {Robertson, Mary. and Walker, Charles Francis.},
	title = {Practical correspondence for colleges},
	publisher = {South-western Pub. Co.},
	year = {[1974]},
	address = {Cincinnati},
	edition = {4th ed.},
	note = {Previous editions by C. F. Walker published under title: Practical business correspondence for colleges.}
}