APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.