Reader's digest Association. (1992). The good health fact book. Reader's digest association.
Dyfyniad Arddull ChicagoReader's digest Association. The Good Health Fact Book. New York: Reader's digest association, 1992.
Dyfyniad MLAReader's digest Association. The Good Health Fact Book. Reader's digest association, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.