APA (7th ed.) Citation

Gardner, M. (1971). Martin Gardner's sixth book of mathematical games from Scientific American. Freeman.

Chicago Style (17th ed.) Citation

Gardner, Martin. Martin Gardner's Sixth Book of Mathematical Games from Scientific American. San Francisco: Freeman, 1971.

MLA (9th ed.) Citation

Gardner, Martin. Martin Gardner's Sixth Book of Mathematical Games from Scientific American. Freeman, 1971.

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