[en] The Joy of Mathematics · Discovering Mathematics All Around You Wide World Publishing
[en] 536 Puzzles & Curious Problems Scribner Book Company
[en] [Gutenberg 52052] • The Puzzle King / Amusing arithmetic, book-keeping blunders, commercial comicalities, curious "catches", peculiar problems, perplexing paradoxes, quaint questions, queer quibbles, school stories, interesting items, tricks with figures, cards, draughts, dice, dominoes, etc., etc., etc. Brisbane, H. J. DIDDAMS & CO., Printers and Publishers, Elizabeth Street
[en] [Gutenberg 29042] • A Tangled Tale Kessinger Publishing
[en] The Secret Life of Equations · the 50 Greatest Equations and How They Work Cassell Illustrated
[en] Paradox · the Nine Greatest Enigmas in Physics Broadway Books
[en] Taking Sudoku Seriously · The Math Behind the World's Most Popular Pencil Puzzle Oxford University Press, USA
[en] Big Data Baseball · Math, Miracles, and the End of a 20-Year Losing Streak Flatiron Books