Watkins, J. J. (2004). Across the board: The mathematics of chessboard problems. Princeton University Press.
Chicago-čujuhus (17. p.)Watkins, John J. Across the Board: The Mathematics of Chessboard Problems. Princeton: Princeton University Press, 2004.
MLA-čujuhus (9. p.)Watkins, John J. Across the Board: The Mathematics of Chessboard Problems. Princeton University Press, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.