Rachman, D. J. (1993). Business today (7th ed.). McGraw-Hill.
Dyfyniad Arddull ChicagoRachman, David J. Business Today. 7th ed. New York: McGraw-Hill, 1993.
Dyfyniad MLARachman, David J. Business Today. 7th ed. McGraw-Hill, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.