Blake, G. (1995). Quick Tips For Better Business Writing. McGraw-Hill.
Dyfyniad Arddull ChicagoBlake, Gary. Quick Tips For Better Business Writing. New York: McGraw-Hill, 1995.
Dyfyniad MLABlake, Gary. Quick Tips For Better Business Writing. McGraw-Hill, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.