Cita APA

Schoenberg, I. E., & Maurer, J. (2012). Focus on grammar 1 (Third edition.). United States of America: Pearson.

Citación estilo Chicago

Schoenberg, Irene E., y Jay Maurer. Focus On Grammar 1. Third edition. United States of America: Pearson, 2012.

Cita MLA

Schoenberg, Irene E., y Jay Maurer. Focus On Grammar 1. Third edition. United States of America: Pearson, 2012.