McAdam, Daniel. "History of Jigsaw Puzzles". American Jigsaw Puzzle Society. Archived from the original on 19 October 2000. பார்க்கப்பட்ட நாள் 13 October 2014.
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McAdam, Daniel. "History of Jigsaw Puzzles". American Jigsaw Puzzle Society. Archived from the original on 19 October 2000. பார்க்கப்பட்ட நாள் 13 October 2014.