Lewis, H. G. (1999). Herschell Gordon Lewis on the art of writing copy (2nd ed.). New York: AMACOM.
Dyfyniad Arddull ChicagoLewis, Herschell Gordon. Herschell Gordon Lewis On the Art of Writing Copy. 2nd ed. New York: AMACOM, 1999.
Dyfyniad MLALewis, Herschell Gordon. Herschell Gordon Lewis On the Art of Writing Copy. 2nd ed. New York: AMACOM, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.