Croxton, F. (1974). Practical Busness statistics. Prentice Hall.
Dyfyniad Arddull ChicagoCroxton, Frederick. Practical Busness Statistics. New Delhi: Prentice Hall, 1974.
Dyfyniad MLACroxton, Frederick. Practical Busness Statistics. Prentice Hall, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.