Dyfyniad APA

Williams, I. (2002). Green light one: Student book. New Yord: McGraw-Hill.

Dyfyniad Arddull Chicago

Williams, Ivor. Green Light One: Student Book. New Yord: McGraw-Hill, 2002.

Dyfyniad MLA

Williams, Ivor. Green Light One: Student Book. New Yord: McGraw-Hill, 2002.

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