Lewis, H. G. (1986). How to make your advertising twice as effective at half the cost. Prentice-Hall.
Chicago-Zitierstil (17. Ausg.)Lewis, Herschell Gordon. How to Make Your Advertising Twice as Effective at Half the Cost. Englewood Cliffs, N.J: Prentice-Hall, 1986.
MLA-Zitierstil (9. Ausg.)Lewis, Herschell Gordon. How to Make Your Advertising Twice as Effective at Half the Cost. Prentice-Hall, 1986.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.