Watkins, J. (2004). Across the Board: The Mathematics of Chessboard Problems. UP.
استشهاد بنمط شيكاغوWatkins, John. Across the Board: The Mathematics of Chessboard Problems. UP, 2004.
MLA استشهادWatkins, John. Across the Board: The Mathematics of Chessboard Problems. UP, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.