Cita APA

Schoenberg, I. E., & Maurer, J. (2006). Focus on Grammar 1: An integrated skills approach (Second edition.). United State: Pearson Longman.

Citación estilo Chicago

Schoenberg, Irene E., y Jay Maurer. Focus On Grammar 1: An Integrated Skills Approach. Second edition. United State: Pearson Longman, 2006.

Cita MLA

Schoenberg, Irene E., y Jay Maurer. Focus On Grammar 1: An Integrated Skills Approach. Second edition. United State: Pearson Longman, 2006.