APA (7th ed.) Citation
Barnhart, C. L., & Barnhart, R. (1993). <The> World Book Dictionary (6. ed.). World Book.
Chicago Style (17th ed.) Citation
Barnhart, Clarence L., and Robert Barnhart. <The> World Book Dictionary. 6. ed. Chicago: World Book, 1993.
MLA (9th ed.) Citation
Barnhart, Clarence L., and Robert Barnhart. <The> World Book Dictionary. 6. ed. World Book, 1993.
Warning: These citations may not always be 100% accurate.