APA (7th ed.) Citation

Gardner, M. (1987). Riddles of the sphinz: And other mathematical puzzle tales. Mathematical Association of America.

Chicago Style (17th ed.) Citation

Gardner, Martin. Riddles of the Sphinz: And Other Mathematical Puzzle Tales. Washington: Mathematical Association of America, 1987.

MLA (9th ed.) Citation

Gardner, Martin. Riddles of the Sphinz: And Other Mathematical Puzzle Tales. Mathematical Association of America, 1987.

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