Logic puzzles.

One hundred prisoners and a light bulb by: (Language materials, printed)

Beef up your brain : = the big book of 301 brain-building exercises, puzzles, and games / by: (Language materials, printed)

Four lives : = a celebration of Raymond Smullyan / by: (Language materials, printed)

Mathematical recreations.

Popular Science.

Intellect

Logic puzzles.

Smullyan, Raymond M.

Logic.

Mathematical Logic and Formal Languages.

Mathematical Logic and Foundations.

Logic, Symbolic and mathematical

Popular Science in Mathematics.