Gardner, M. (1987). Riddles of the sphinx and other mathematical puzzle tales. Mathematical Association of America.
Tohutoru Kātū Chicago (17th ed.)Gardner, Martin. Riddles of the Sphinx and Other Mathematical Puzzle Tales. Washington, D.C.: Mathematical Association of America, 1987.
Tohutoro MLA (9th ed.)Gardner, Martin. Riddles of the Sphinx and Other Mathematical Puzzle Tales. Mathematical Association of America, 1987.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.