Summers, G. J. (1986). The great book of mind teasers & mind puzzlers. Sterling.
Cita Chicago (17th ed.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. New York: Sterling, 1986.
Cita MLA (9th ed.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. Sterling, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.