Cita APA

Beaumont, J., & Beaumont, J. (2009). NorthStar 1: Reading and writing (2. edition.). New York: Pearson/Longman.

Citación estilo Chicago

Beaumont, John, y John Beaumont. NorthStar 1: Reading and Writing. 2. edition. New York: Pearson/Longman, 2009.

Cita MLA

Beaumont, John, y John Beaumont. NorthStar 1: Reading and Writing. 2. edition. New York: Pearson/Longman, 2009.