Cita APA (7a ed.)

Swan, M., & Baker, D. (2008). Grammar scan answer key (Third edition.). Oxford University Press.

Cita Chicago Style (17a ed.)

Swan, Michael, y David Baker. Grammar Scan Answer Key. Third edition. New York: Oxford University Press, 2008.

Cita MLA (9a ed.)

Swan, Michael, y David Baker. Grammar Scan Answer Key. Third edition. Oxford University Press, 2008.