Cita APA

Fuchs, M., Bonner, M., & Curtis, J. (2006). Focus on Grammar 4: An integrated skills approach (third edition.). United State: Pearson Longman.

Citación estilo Chicago

Fuchs, Marjorie, Margaret Bonner, y Jane Curtis. Focus On Grammar 4: An Integrated Skills Approach. third edition. United State: Pearson Longman, 2006.

Cita MLA

Fuchs, Marjorie, Margaret Bonner, y Jane Curtis. Focus On Grammar 4: An Integrated Skills Approach. third edition. United State: Pearson Longman, 2006.