Dyfyniad APA

Williams, I., & Dermot Curley. (2003). Green light four: Student book. New York, NY: McGraw-Hill.

Dyfyniad Arddull Chicago

Williams, Ivor., và Dermot Curley. Green Light Four: Student Book. New York, NY: McGraw-Hill, 2003.

Dyfyniad MLA

Williams, Ivor., và Dermot Curley. Green Light Four: Student Book. New York, NY: McGraw-Hill, 2003.

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