Cita APA (7a ed.)
Willis, D. (1992). Collins Cobuild Student's Grammar: Reference and Practice through Real English. HarperCollins Publishers Ltd.
Cita Chicago Style (17a ed.)
Willis, Dave. Collins Cobuild Student's Grammar: Reference and Practice Through Real English. London: HarperCollins Publishers Ltd, 1992.
Cita MLA (9a ed.)
Willis, Dave. Collins Cobuild Student's Grammar: Reference and Practice Through Real English. HarperCollins Publishers Ltd, 1992.
Precaución: Estas citas no son 100% exactas.