Challenging Lateral Thinking Puzzles

The Oxford Dictionary of World Religions

More math puzzles and games

Knock Knock Jokes (Dover Game and Puzzle Activity Books)

Hidden Pictures (Dover Game and Puzzle Activity Books)

Puzzle Castle (Usborne Young Puzzle Books)

Time Train to Ancient Rome (Usborne Puzzle Adventures Ser.)

Dictionary of Theories

Dictionary of Psychology

Dream Dictionary : An A to Z Guide to Understanding Your Unconsious Mind