APA (7th ed.) Citation

Gass, S. M., Plonsky, L., & Behney, J. (2020). Second language acquisition: An introductory course (Fifth edition.). Routledge.

Chicago Style (17th ed.) Citation

Gass, Susan M., Luke Plonsky, and Jennifer Behney. Second Language Acquisition: An Introductory Course. Fifth edition. New York, NY: Routledge, 2020.

MLA (9th ed.) Citation

Gass, Susan M., et al. Second Language Acquisition: An Introductory Course. Fifth edition. Routledge, 2020.