References billcutlerpuzzles.com

1. Appel, K. and W. Haken, the solution of the four-color-map problem, Scientific American, September, 1977, pp. 108-121.
2. Cross, C.A., The Chinese Cross, Pentangle, 1979.
3. Cutler, William, "The Six-Piece Burr", Journal of Recreational Mathematics, vol 10(4), 1977-78, pp.241-250.
4. Cutler, William, unpublished computer analysis, 1973-1977.
5. Cutler, William, "Holey 6-Piece Burr!", 1986.
6. Dewdney, A.K., Computer Recreations column of Scientific American, October, 1985, pp.16-27.
7. Gardner, Martin, Mathematical Games column of Scientific American, January, 1978, pp.14-26.
8. Wyatt, E.M., Puzzles in Wood, 1928, The Bruce Publishing Company, reprinted in 1983 by Woodcraft Supply Corporation.
9. Wyatt, E.M., Wonders in Wood, 1946, The Bruce Publishing Company.

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