[en] Maths on the Back of an Envelope HarperCollins
[en] 100 Maddening Mindbending Puzzles Pavilion Books
[en] Mindbenders and Brainteasers · 100 Maddening Mindbenders and Curious Conundrums Robson Books, Limited
[en] Why Do Buses Come in Threes · the Hidden Mathematics of Everyday Life John Wiley & Sons
[en] How Long Is a Piece of String? Portico