Gardner, H. The Advertising Agency Business. Lincolnwood, Illinois: NTC Business Books, 1989 229 с. : с табл. 0-8442-3167-3.
Gardner, H. The Advertising Agency Business. Lincolnwood, Illinois: NTC Business Books, 1989 229 с. : с табл. 0-8442-3167-3.
Gardner, H. (1989) The Advertising Agency Business, Lincolnwood, Illinois: NTC Business Books 229 с. : с табл. 0-8442-3167-3.
Gardner, H. (1989). The Advertising Agency Business. The Complete Manual for Management & Operation. Lincolnwood, Illinois: NTC Business Books, 229 с. : с табл.
Gardner H. The Advertising Agency Business: The Complete Manual for Management & Operation. Lincolnwood, Illinois: NTC Business Books; 1989. p. 229 с. : с табл. ISBN: 0-8442-3167-3.