APA (7th ed.) Citation

Gardner, M. (1990). Mathematical circus : more games, puzzles, paradoxes and other mathematical entertainments from Scientific American / Martin Gardner: More games, puzzles, paradoxes and other mathematical entertainments from Scientific American. Penguin.

Chicago Style (17th ed.) Citation

Gardner, Martin. Mathematical Circus : More Games, Puzzles, Paradoxes and Other Mathematical Entertainments from Scientific American / Martin Gardner: More Games, Puzzles, Paradoxes and Other Mathematical Entertainments from Scientific American. London: Penguin, 1990.

MLA (9th ed.) Citation

Gardner, Martin. Mathematical Circus : More Games, Puzzles, Paradoxes and Other Mathematical Entertainments from Scientific American / Martin Gardner: More Games, Puzzles, Paradoxes and Other Mathematical Entertainments from Scientific American. Penguin, 1990.

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