APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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