Summers, G. J. (1986). The great book of mind teasers & mind puzzlers. Sterling.
Lua i Stíl Chicago (17ú heag.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. New York: Sterling, 1986.
Lua MLA (9ú heag.)Summers, George J. The Great Book of Mind Teasers & Mind Puzzlers. Sterling, 1986.
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