Citazione Stile APA (7a Edizione)
Willis, D. (1992). Collins Cobuild Student's Grammar: Reference and Practice through Real English. HarperCollins Publishers Ltd.
Citazione stile Chigago Style (17a edizione)
Willis, Dave. Collins Cobuild Student's Grammar: Reference and Practice Through Real English. London: HarperCollins Publishers Ltd, 1992.
Citatione MLA (9a ed.)
Willis, Dave. Collins Cobuild Student's Grammar: Reference and Practice Through Real English. HarperCollins Publishers Ltd, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.