Cita APA

Schoenberg, I. E. 1., & Maurer, J. (2017). Focus on grammar 1: An integrated skills approach (Fourth edition.).

Citación estilo Chicago

Schoenberg, Irene E. 1946-, y Jay Maurer. Focus On Grammar 1: An Integrated Skills Approach. Fourth edition. 2017.

Cita MLA

Schoenberg, Irene E. 1946-, y Jay Maurer. Focus On Grammar 1: An Integrated Skills Approach. Fourth edition. 2017.