Cita APA (7a ed.)

Gass, S. M., & Selinker, L. (2008). Second language acquisition: An introductory course (3rd ed.). Routledge.

Cita Chicago Style (17a ed.)

Gass, Susan M., y Larry Selinker. Second Language Acquisition: An Introductory Course. 3rd ed. New York ; London: Routledge, 2008.

Cita MLA (9a ed.)

Gass, Susan M., y Larry Selinker. Second Language Acquisition: An Introductory Course. 3rd ed. Routledge, 2008.