Cita APA (7th ed.)

Gardner, M. (1988). Riddles of the sphinx: And other mathematical puzzle tales. The Mathematical Association of America.

Cita Chicago (17th ed.)

Gardner, Martin. Riddles of the Sphinx: And Other Mathematical Puzzle Tales. Washington, D.C: The Mathematical Association of America, 1988.

Cita MLA (9th ed.)

Gardner, Martin. Riddles of the Sphinx: And Other Mathematical Puzzle Tales. The Mathematical Association of America, 1988.