Gardner, M. (1987). Riddles of the sphinz: And other mathematical puzzle tales. Mathematical Association of America.
Chicago Style (17th ed.) CitationGardner, Martin. Riddles of the Sphinz: And Other Mathematical Puzzle Tales. Washington: Mathematical Association of America, 1987.
MLA (9th ed.) CitationGardner, Martin. Riddles of the Sphinz: And Other Mathematical Puzzle Tales. Mathematical Association of America, 1987.