Naber, T., Blackwell, A., & Johnstone, M. (2003). English knowhow. New York: Oxford University Press.
Dyfyniad Arddull ChicagoNaber, Therese., Angela Blackwell, và Michelle Johnstone. English Knowhow. New York: Oxford University Press, 2003.
Dyfyniad MLANaber, Therese., Angela Blackwell, và Michelle Johnstone. English Knowhow. New York: Oxford University Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.