Summers, G. J. (1986). The great book of mind teasers & mind puzzlers. Sterling.
Cita Chicago Style (17a ed.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. New York: Sterling, 1986.
Cita MLA (9a ed.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. Sterling, 1986.
Precaución: Estas citas no son 100% exactas.