APA (7th ed.) Citation

Lewis, H. G., & Nelson, C. (1996). World's greatest direct mail sales letters. NTC Business Books.

Chicago Style (17th ed.) Citation

Lewis, Herschell Gordon, and Carol Nelson. World's Greatest Direct Mail Sales Letters. Lincolnwood, Ill.: NTC Business Books, 1996.

MLA (9th ed.) Citation

Lewis, Herschell Gordon, and Carol Nelson. World's Greatest Direct Mail Sales Letters. NTC Business Books, 1996.