Morris, D. G. (2002). Calculate with confidence. London: Mosby.
Dyfyniad Arddull ChicagoMorris, Deborah Gray. Calculate With Confidence. London: Mosby, 2002.
Dyfyniad MLAMorris, Deborah Gray. Calculate With Confidence. London: Mosby, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.