Denman, B. R. (2007). Step language for everyday life forward 4. New York: Oxford University Press.
Dyfyniad Arddull ChicagoDenman, Barbara R. Step Language for Everyday Life Forward 4. New York: Oxford University Press, 2007.
Dyfyniad MLADenman, Barbara R. Step Language for Everyday Life Forward 4. New York: Oxford University Press, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.