Cita APA (7a ed.)

(1990). Collins cobuild English grammar: [helping learners with real English]. HarperCollins.

Cita Chicago Style (17a ed.)

Collins Cobuild English Grammar: [helping Learners with Real English]. London: HarperCollins, 1990.

Cita MLA (9a ed.)

Collins Cobuild English Grammar: [helping Learners with Real English]. HarperCollins, 1990.

Precaución: Estas citas no son 100% exactas.