Dyfyniad APA

Williams, I. (2003). Green light four: Student book. London: McGraw-Hill/ELT.

Dyfyniad Arddull Chicago

Williams, Ivor. Green Light Four: Student Book. London: McGraw-Hill/ELT, 2003.

Dyfyniad MLA

Williams, Ivor. Green Light Four: Student Book. London: McGraw-Hill/ELT, 2003.

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