Citazione Stile APA (7a Edizione)

Bonner, M. (1994). Focus on grammar. Teacher's manual. An intermediate course for reference and practice. Addison-Wesley.

Citazione stile Chigago Style (17a edizione)

Bonner, Margaret. Focus on Grammar. Teacher's Manual. An Intermediate Course for Reference and Practice. Reading: Addison-Wesley, 1994.

Citatione MLA (9a ed.)

Bonner, Margaret. Focus on Grammar. Teacher's Manual. An Intermediate Course for Reference and Practice. Addison-Wesley, 1994.