APA (7th ed.) Citation

Townsend, C. B. (1991). Worlds thoughest puzzles. Sterling Publications.

Chicago Style (17th ed.) Citation

Townsend, Charles Barry. Worlds Thoughest Puzzles. New York: Sterling Publications, 1991.

MLA (9th ed.) Citation

Townsend, Charles Barry. Worlds Thoughest Puzzles. Sterling Publications, 1991.

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