APA (7th ed.) Citation

Gass, S. M., & Mackey, A. (2012). The Routledge handbook of second language acquisition. Routledge.

Chicago Style (17th ed.) Citation

Gass, Susan M., and Alison Mackey. The Routledge Handbook of Second Language Acquisition. London ; New York, NY: Routledge, 2012.

MLA (9th ed.) Citation

Gass, Susan M., and Alison Mackey. The Routledge Handbook of Second Language Acquisition. Routledge, 2012.