APA (7th ed.) Zitazioa

Collins Cobuild. (1988). Essential english dictionary. HarperCollins.

Chicago Style (17th ed.) Zitazioa

Collins Cobuild. Essential English Dictionary. Londres: HarperCollins, 1988.

MLA (9th ed.) Zitazioa

Collins Cobuild. Essential English Dictionary. HarperCollins, 1988.