Maurer J. Jay. (1995). Focus on Grammar: Teacher`s manual. White Plains, Longman, 1995.
Cita Chicago (17th ed.)Maurer J. Jay. Focus on Grammar: Teacher`s Manual. White Plains, Longman, 1995, 1995.
Cita MLA (9th ed.)Maurer J. Jay. Focus on Grammar: Teacher`s Manual. White Plains, Longman, 1995, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.