APA (7th ed.) Citation

Guthrie & Preston. (2005). Improve your brain power: 400 games, puzzles, and teasers to unlock your mind. Reader's Digest Association.

Chicago Style (17th ed.) Citation

Guthrie and Preston. Improve Your Brain Power: 400 Games, Puzzles, and Teasers to Unlock Your Mind. Pleasantville: Reader's Digest Association, 2005.

MLA (8th ed.) Citation

Guthrie and Preston. Improve Your Brain Power: 400 Games, Puzzles, and Teasers to Unlock Your Mind. Reader's Digest Association, 2005.