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. Routledge, 2012.

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.