Cita APA (7a ed.)
Schoenberg, I. E., & Maurer, J. (2006). Focus on Grammar 1: An integrated skills approach (Second edition.). Pearson Longman.
Cita Chicago Style (17a ed.)
Schoenberg, Irene E., y Jay Maurer. Focus on Grammar 1: An Integrated Skills Approach. Second edition. United State: Pearson Longman, 2006.
Cita MLA (9a ed.)
Schoenberg, Irene E., y Jay Maurer. Focus on Grammar 1: An Integrated Skills Approach. Second edition. Pearson Longman, 2006.
Precaución: Estas citas no son 100% exactas.