APA (7th ed.) Citation

Gass, S. M., & Selinker, L. (1994). Second language acquisition: An introductory course. Erlbaum.

Chicago Style (17th ed.) Citation

Gass, Susan M., and Larry Selinker. Second Language Acquisition: An Introductory Course. Hillsdale, NJ [u.a.]: Erlbaum, 1994.

MLA (9th ed.) Citation

Gass, Susan M., and Larry Selinker. Second Language Acquisition: An Introductory Course. Erlbaum, 1994.