Magic Holetite Pencil Slocum, Botermans; New Book of Puzzles, Freeman, New York, 1992, p78-79 References - Clifford W. Ashley; The Ashley Book of Knots, New York, 1944
(german: Das Ashley-Buch der Knoten, Edition Maritim, Hamburg, 5. Aufl. 1997) Chapter 33: tricks and puzzles, diagram 2611 (Pseudo-Magic-Pencil solution) - Henry Ernest Dudeney; Puzzles and Curious Problems, Thomas Nelson and Sons, Ltd., London 1931,
Problem 349: Releasing the Stick (German: Geduldsspiele der Welt, Hugendubel, 1987, p114) Note: The bet is $100. - Jerry Slocum, Botermans; New Book of Puzzles, Freeman, New York, 1992, p78-79
Name: Buttonhole Puzzle later sold as Magic Holetite Pencil - Jerry Slocum; The Puzzle Arcade, Klutz, 1996, ISBN 1-57054-056-X, p4
Name: The Buttonhole Killer Pencil The book contains the buttonhole puzzle. - Wei Zhang; Exploring Math Through Puzzles, Key Curriculum Press, 1996, ISBN 1-55953-222-X,
p29-31, Section: Loop Extension Puzzles. Name: Magic Pencil, puzzle 7 p70, Name: Bugballs (Dutch: Treiterballen, Treiterkraaltjes), Inventors: Christian Freeling, Anneke Treep, puzzle 27 (Het Knoopeknauwertje No. 5 (April 1997))
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