Cunningham, S., & Bowler, B. (1994). Headway: Intermediate Pronunciation. Thanh Hóa: Thanh Hóa.
Dyfyniad Arddull ChicagoCunningham, Sarah., và Bill Bowler. Headway: Intermediate Pronunciation. Thanh Hóa: Thanh Hóa, 1994.
Dyfyniad MLACunningham, Sarah., và Bill Bowler. Headway: Intermediate Pronunciation. Thanh Hóa: Thanh Hóa, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.