Williams, K. S. (1996). Redbook of mathematical problems. Dover Publications.
Dyfyniad Arddull ChicagoWilliams, Kenneth S. Redbook of Mathematical Problems. New York: Dover Publications, 1996.
Dyfyniad MLAWilliams, Kenneth S. Redbook of Mathematical Problems. Dover Publications, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.