On Sam Loyd:

"The Prince of Puzzle Makers." George Grantham Bain. The Strand

Magazine, Vol. 34, December 1907, pages 771-777. "My Fifty Years in Puzzleland: Sam Loyd and His Ten Thousand Brain-Teasers." Walter Prichard Eaton. The Delineator, April 1911, page 274.

The Mathematical Puzzles of Sam Loyd. Edited by Martin Gardner. Vol. 1, Dover, 1959; Vol. 2, Dover, 1960.

On vanishing figures:

Mathematics, Magic and Mystery. Martin Gardner. Dover, 1956. "The Disappearing Man and Other Vanishing Paradoxes." Mel Stover. Games, November-December 1980, pages 14—18.

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