Blackwell, A., Manin, G. J., & Naber, T. (2003). English knowhow: Student book 1. New York: Oxford University Press.
Dyfyniad Arddull ChicagoBlackwell, Angela, Gregory J. Manin, và Therese Naber. English Knowhow: Student Book 1. New York: Oxford University Press, 2003.
Dyfyniad MLABlackwell, Angela, Gregory J. Manin, và Therese Naber. English Knowhow: Student Book 1. New York: Oxford University Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.