APA (7th ed.) Citation

Lewis. (1989). 20 days to better spelling. New American Library.

Chicago Style (17th ed.) Citation

Lewis. 20 Days to Better Spelling. New York, N.Y: New American Library, 1989.

MLA (8th ed.) Citation

Lewis. 20 Days to Better Spelling. New American Library, 1989.

Warning: These citations may not always be 100% accurate.