Bonner, M. (1994). Focus on grammar. Teacher's manual. An intermediate course for reference and practice. Addison-Wesley.
Chicago-Zitierstil (17. Ausg.)Bonner, Margaret. Focus on Grammar. Teacher's Manual. An Intermediate Course for Reference and Practice. Reading: Addison-Wesley, 1994.
MLA-Zitierstil (9. Ausg.)Bonner, Margaret. Focus on Grammar. Teacher's Manual. An Intermediate Course for Reference and Practice. Addison-Wesley, 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.