Dyfyniad APA

Elaine Walker. (1998). Grammar practice for upper intermediate students. Harlow, Eng: Pearson.

Dyfyniad Arddull Chicago

Elaine Walker. Grammar Practice for Upper Intermediate Students. Harlow, Eng: Pearson, 1998.

Dyfyniad MLA

Elaine Walker. Grammar Practice for Upper Intermediate Students. Harlow, Eng: Pearson, 1998.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.