APA (7th ed.) Citation

Barnhart, C. L., & Barnhart, R. K. (1990). The world book dictionary. World Book.

Chicago Style (17th ed.) Citation

Barnhart, Clarence Lewis, and Robert K. Barnhart. The World Book Dictionary. Chicago: World Book, 1990.

MLA (9th ed.) Citation

Barnhart, Clarence Lewis, and Robert K. Barnhart. The World Book Dictionary. World Book, 1990.

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