Cita APA

Firsten, R. (2004). Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST.

Citación estilo Chicago

Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.

Cita MLA

Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.