Murphy, R. Basic Grammar in use. Reference and practice for students of English (5a ed.).
Citazione stile Chigago Style (17a edizione)Murphy, Raymond. Basic Grammar in Use. Reference and Practice for Students of English. 5a ed.
Citatione MLA (8a ed.)Murphy, Raymond. Basic Grammar in Use. Reference and Practice for Students of English. 5a ed.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.