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    Was hat Pythagoras mit Girlanden zu tun?: Die 125 besten Rätsel aus 2000 Jahren Mathematik
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    Im Wunderland der Zahlen: Eine mathemagische Reise
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    The Language Lover's Puzzle Book (Puzzle Books)
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    So you think you've got problems?: Surprising and Rewarding Puzzles to Sharpen Your Mind.
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    Was hat Pythagoras mit Girlanden zu tun?: Die 125 besten Rätsel aus 2000 Jahren Mathematik
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    Warum die Elf hat, was die Zehn nicht hat: Entdeckungstouren in die faszinierende Welt der Zahlen
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    Alex Through the Looking-Glass: How Life Reflects Numbers and Numbers Reflect Life
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