Withrow, J. (1987). Effective Writing: Writing Skills for Intermediate Students of American English; Student"s Book. Cambridge: Cambridge University.
Dyfyniad Arddull ChicagoWithrow, Jean. Effective Writing: Writing Skills for Intermediate Students of American English; Student"s Book. Cambridge: Cambridge University, 1987.
Dyfyniad MLAWithrow, Jean. Effective Writing: Writing Skills for Intermediate Students of American English; Student"s Book. Cambridge: Cambridge University, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.