Caples, John. Tested advertising methods / John Caples. - 4th ed., rev. and enl. - Englewood Cliffs, N.J. : Prentice-Hall, 1974. - 318 p. : ill.; 21 cm. Includes indexes. ISBN: 0139069097 Subjects--Topical Terms: Advertising. Dewey Class. No.: 659.13 / CAT 1974