Hopkins, C. C. (1986). My life in advertising & scientific advertising: Two works. NTC Business Books.
Chicago-referens (17:e uppl.)Hopkins, Claude C. My Life in Advertising & Scientific Advertising: Two Works. Lincoln, Ill: NTC Business Books, 1986.
MLA-referens (9:e uppl.)Hopkins, Claude C. My Life in Advertising & Scientific Advertising: Two Works. NTC Business Books, 1986.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.