Tyson, K. W. (1997). Competition in the 21st century. St. Lucie Press.
Dyfyniad Arddull ChicagoTyson, Kirk W.M. Competition in the 21st Century. Delray Beach, FL: St. Lucie Press, 1997.
Dyfyniad MLATyson, Kirk W.M. Competition in the 21st Century. St. Lucie Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.