Freund, J. E., & John E. Freund. (2001). Modern Elementary Statistics. Upper Saddle River: Prentice Hall.
Dyfyniad Arddull ChicagoFreund, John E., và John E. Freund. Modern Elementary Statistics. Upper Saddle River: Prentice Hall, 2001.
Dyfyniad MLAFreund, John E., và John E. Freund. Modern Elementary Statistics. Upper Saddle River: Prentice Hall, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.